SI Waves
description
Transcript of SI Waves
![Page 1: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/1.jpg)
1
SI Waves
8 West SI
![Page 2: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/2.jpg)
2
We are learning to: demonstrate how waves transfer energy.
We are looking for: a disturbance or variation that
transfers energy from one point to another point in a medium.
Transverse waves- wave and medium move in direction that is perpendicular to each other
Longitudinal waves- wave and medium move in same direction
![Page 3: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/3.jpg)
3
What are Waves?
• A wave is a disturbance that transfers energy from place to place
• Waves travel through a material called a medium.
• Waves that require a medium to travel through are called mechanical waves.
![Page 4: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/4.jpg)
4
What are Waves?
• Waves are created when a source of energy causes a medium to vibrate.
• A vibration is a repeated back-and-forth or up-and –down motion.
![Page 5: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/5.jpg)
5
Classification of Waves
• Wave are classified according to how they move.
• Types of waves:1. Transverse2. Longitudinal3. Surface
![Page 6: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/6.jpg)
6
Transverse Wave
• In transverse waves, the particles of the medium move perpendicular in the direction of the wave.
• Parts of the transverse wave:– Crest– Trough– Wavelength– Amplitude
![Page 7: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/7.jpg)
7
Longitudinal Wave
• In longitudinal waves, the particles of the wave move parallel to direction of the wave movement.
• Parts of the wave:– Compressions– Rarefactions– Wavelength
![Page 8: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/8.jpg)
8
Surface Wave
• Surface waves occur at the boundary between two mediums and are a combination of transverse and longitudinal waves.
![Page 9: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/9.jpg)
9
A transverse wave…..
A. B. C. D. E.
0 0 000
A. Vibrates particles perpendicular to the direction of wave
B. Vibrates particles parallel to the direction of the wave
C. Vibrates both parallel and perpendicular to the direction of the wave
D. Vibrates particles in one directionE. Help! I don’t understand.
0of5
10
![Page 10: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/10.jpg)
10
What type of wave is represented by
picture?
A. B. C. D. E.
0 0 000
A. TransverseB. LongitudinalC. SurfaceD. Seismic E. Help! I don’t
understand.
0of5
10
![Page 11: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/11.jpg)
11
A wave is a disturbance that transfers
A. B. C. D. E.
0 0 000
A. matter.B. particles.C. energy.D. a medium.E. Help! I don’t
understand.
0of5
10
![Page 12: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/12.jpg)
12
What do you call the material that a wave travels through?
A. B. C. D. E.
0 0 000
A. PlasmaB. SpaceC. VacuumD. MediumE. Help! I don’t
understand.
0of5
10
![Page 13: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/13.jpg)
13
What type of wave is
represented by the animation?
A. B. C. D. E.
0 0 000
A. LongitudinalB. TransverseC. SurfaceD. SeismicE. Help! I don’t
understand.
0of5
10
![Page 14: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/14.jpg)
14
Transverse WaveDefine (in own Words) Example (from own life)
Picture /Graphic Representation of how this wave transfers energy
![Page 15: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/15.jpg)
15
Longitudinal WaveDefine (in own Words) Example (from own life)
Picture /Graphic Representation of how this wave transfers energy
![Page 16: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/16.jpg)
16
We are learning to: describe the properties of waves.
We are looking for: Wavelength-distance from crest to crest (transverse wave), or from compression to compression (longitudinal wave)Frequency-number of waves that pass a given point each secondAmplitude-distance from rest position to the crest (transverse wave); measures how compressed the particles of the medium are (longitudinal wave); determines the amount of energy of each wave
![Page 17: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/17.jpg)
Wave Properties(continued)
• Wavelength is the distance from one crest to the crest of the next wave.
• Period is the time required for one full wavelength of a wave to pass a certain point.
• Frequency of a wave is the number of full wavelengths that pass a point in a given time interval.
17
![Page 18: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/18.jpg)
Wave Properties
• Transverse waves have the shape of a sine curve.
• Highest point of a transverse wave is a crest.
• Lowest point of a transverse wave is a trough.
• Amplitude is the greatest distance that particles are displaced from their normal resting position.
18
![Page 19: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/19.jpg)
Frequency-Period Equation
• Frequency=1/period• F=1/T• Frequency is measured
in a unit called a hertz.
19
![Page 20: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/20.jpg)
Wave Speed
• wave speed=frequency x wavelength
• v = f x λ
20
![Page 21: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/21.jpg)
21
In the diagram, identify the wave property “A”
A. B. C. D.
0 000
A. FrequencyB. AmplitudeC. WavelengthD. Help! I don’t understand.
0of5
10
![Page 22: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/22.jpg)
22
Which of the following is true about waves in the diagram?
A. B. C. D.
0 000
A. Wave X has a higher frequency than Wave Y
B. Wave X has a lower frequency than Wave Y
C. Wave X has the same frequency as Wave Y
D. Help! I don’t understand.
0of5
10
![Page 23: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/23.jpg)
23
Which of the waves in the picture has the greatest
amplitude?
1
2
3
1 2 3
Help! I don’t u
nderstand.
0 000
A. 1B. 2C. 3D. Help! I don’t understand.
0of5
10
![Page 24: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/24.jpg)
24
Which property measures the amount of energy transferred by a wave?
A. B. C. D.
0 000
A. WavelengthB. FrequencyC. AmplitudeD. Help! I don’t
understand.
0of5
10
![Page 25: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/25.jpg)
25
ALIKE BUT DIFFERENT
![Page 26: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/26.jpg)
26
We are learning to demonstrate how waves transfer energy.
We are looking for how waves interact with an object or other waves. They either:
Transmit-wave energy passes through an object.
Reflect-wave energy bounces off an object.
Refract – wave changes speed as it passes from one medium to another medium
Diffract – wave spreads out as it passes through an opening or around the edge of a barrier
Absorb-wave energy is taken in by an object they encounter.
Interference-wave energy of multiple waves is combined.
![Page 27: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/27.jpg)
Reflection
• Reflection is the bouncing back of a wave when it meets a surface or boundary.
27
![Page 28: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/28.jpg)
Diffraction
• Diffraction is when a wave bends around an object or opening.
28
![Page 29: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/29.jpg)
Refraction
• Refraction is the bending of a wave as it passes from one medium to another medium.
29
![Page 30: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/30.jpg)
Wave Interference
• Wave interference is when several waves are in the same location and the waves combine to produce a single, new wave that is different from the original waves.
30
![Page 31: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/31.jpg)
Constructive Interference
• The result of two individual waves coming together to produce a wave of greater amplitude is called constructive interference.
31
![Page 32: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/32.jpg)
Destructive Interference
• The result of two individual waves coming together to produce a wave of lesser amplitude than the larger of the original waves is called destructive interference.
32
![Page 33: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/33.jpg)
33
What happens to the energy of the wave when the crest of the blue wave meets the crest of the green wave?
A. B. C. D.
3
0
4
10
A. Energy decreases.B. Energy increases.C. Energy stays the
same.D. I don’t get it! Help!
![Page 34: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/34.jpg)
34
What is it called when a wave bounces off of a barrier?
a. b. c. d.
0% 0%0%
100%a. Refractionb. Reflectionc. Diffractiond. Help! I don’t know.
![Page 35: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/35.jpg)
35
What happens to waves as they go through an opening or around a
corner of an object?
A. B. C. D.
6%0%
94%
0%
A. They are refracted.B. They are reflected.C. They are diffracted.D. Help! I don’t know.
![Page 36: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/36.jpg)
36
As waves go through different mediums, what happens to them?
A. B. C. D.
17%
0%6%
78%
A. Waves change speed and are reflected.
B. Waves change speed and are refracted.
C. Waves change speed and are diffracted.
D. Help! I don’t know.
![Page 37: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/37.jpg)
37
ALIKE BUT DIFFERENT
Reflection, Refraction & Diffraction
![Page 38: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/38.jpg)
38
We are learning to: demonstrate that vibrations produce longitudinal waves which move away from the original source. We are looking for: an explanation of the following:
• A medium is required (mechanical wave)• A sound is produced (acoustic energy)• A vibration is required to produce sound waves (longitudinal wave)
![Page 39: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/39.jpg)
Sound
• Sound waves are caused by vibrations, and carry energy through a medium.
• Sound waves are longitudinal waves.
• Speed of sound depends on the medium.
39
![Page 40: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/40.jpg)
Speed of Sound
• Speed of sound at room temperature is about 346 m/s.
• An increase in temperature increases the speed of sound.
• Sound waves travel faster in liquids & solids than gases.
40
![Page 41: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/41.jpg)
41
Energy is required to create a sound wave. Sound energy is also known as . . .
A. B. C. D. E.
0 0 000
A. Elastic potential energy
B. Radiant energyC. Acoustic energyD. Thermal energyE. Help! I don’t
understand.
0of5
10
![Page 42: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/42.jpg)
42
How does sound transfer energy?
A. B. C. D.
0 000
A. By vibration of a medium, producing a transverse wave.
B. By vibration of a medium, producing a longitudinal wave.
C. By vibration of a medium, producing a surface wave.
D. Help! I don’t know.
0of5
10
![Page 43: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/43.jpg)
43
Sound cannot be heard in which of the following locations?
A. B. C. D. E.
0 0 000
A. In a buildingB. Under waterC. In spaceD. In the forestE. Help! I don’t know.
0of5
10
![Page 44: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/44.jpg)
44
FOUR BLOCK INTERVENTION INSTRUCTIONS
1. If you have not missed any questions, start with block #2 and then complete blocks #3 and #4.
2. If you have missed 2 or more, meet with the teacher.
3. Everyone else starts in block #1 and then complete blocks #2, #3, and #4.
![Page 45: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/45.jpg)
45
3. REVIEW
1. PRACTICE
4. FRONTLOAD
2. EXTENSION
A tree falls in a forest and no one is around to hear it. Is a sound produced?
Using your knowledge of sound waves, write a paragraph (6-10 sentences)explaining why or why not?
Draw a transverse wave and a longitudinal wave.
Label all of their parts.
What do you know about the electromagnetic spectrum?
Explain how a sound is produced when you beat a drum.
![Page 46: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/46.jpg)
46
We are learning to: demonstrate that vibrations produce longitudinal waves which move away from the original source.
We are looking for: the identification of the properties of sound.Intensity-how much energy sound hasLoudness-our perception of intensityPitch-frequency of waves produced (highness and lowness of sound) (i.e. Doppler Effect)
![Page 47: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/47.jpg)
Loudness determined by Intensity
• Intensity of a sound wave describes the rate at which a sound wave transmits energy through a given area of the medium.
• Loudness depends on the intensity of the sound wave.
• The greater the intensity, the louder the sound.
47
![Page 48: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/48.jpg)
Relative Intensity
• The relative intensity of sounds is found by comparing the intensity of a sound with the intensity of the quietest sound a person can hear.
• Relative intensity is measured in units called decibels.
48
![Page 49: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/49.jpg)
Pitch
• The pitch of a sound is related to the frequency of sound waves.
• High pitch correspond to a high frequency, and low pitch corresponds to a low frequency.
49
![Page 50: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/50.jpg)
The Doppler Effect
• The apparent change in frequency as a wave source moves in relation to the listener is called the Doppler Effect.
• As sound source moves toward the listener, the waves reach the listener with a higher frequency.
• The pitch appears to increase because of the Doppler effect.
50
![Page 51: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/51.jpg)
51
As the frequency of a sound wave decreases. . . .
A. B. C. D.
0 000
A. Pitch increases.B. Pitch decreases.C. Pitch stays the
same.D. Help! I don’t know.
0of5
10
![Page 52: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/52.jpg)
52
An ambulance is coming towards you. What happens to the sound waves?
A. B. C. D. E.
0 0 000
A. Frequency decreases and pitch decreases
B. Frequency increases and pitch decreases
C. Frequency decreases and pitch increases
D. Frequency increases and pitch increases
E. Help! I don’t know.
0of5
10
![Page 53: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/53.jpg)
53
How are loudness and intensity related?
A. B. C. D.
0 000
A. The louder the sound the less the intensity
B. The louder the sound the more the intensity
C. There is no relationship between loudness and intensity
D. Help! I don’t know.
0of5
10
![Page 54: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/54.jpg)
54
Please copy circle and do this.
?
Pitch
Sound
• Fill in words that closely relates to the two words given.
• Write a paragraph explaining why you chose each word and how they fit together to form a concept.
?
![Page 55: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/55.jpg)
55
We are learning to: describe electromagnetic waves and give specific examples of several types.
We are looking for: 1. Description:-transverse waves that change between electric and magnetic fields.-waves that do not require a medium -the energy that is transferred by electromagnetic waves (electromagnetic radiation)
2. Examples of EM waves based on wavelengths and frequency:-Radio wave-longest wavelength; lowest frequency-Infrared-Visible light-Ultraviolet-x-ray-gamma rays-shortest wavelength; highest frequency
![Page 56: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/56.jpg)
Electromagnetic Spectrum
• Electromagnetic spectrum consist of light of all possible energies, frequencies and wavelengths.
• Ultraviolet light has higher energy and shorter wavelengths than purple light.
• X-rays has higher energy and shorter wavelengths.
• Gamma rays has the highest energy and shortest wavelengths.
56
![Page 57: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/57.jpg)
Electromagnetic Spectrum continued
• Infrared waves has wavelengths slightly longer than red light.
• Microwaves are used for cooking.
• Radio waves have the longest wavelengths.
• Radar is used to determine location.
57
![Page 58: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/58.jpg)
58
One characteristic of EM waves is:
A. B. C. D.
0 000
A. travels as a longitudinal wave
B. does not require a medium
C. does not travel as a transverse wave
D. I need help!!
0of5
10
![Page 59: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/59.jpg)
59
Which form of electromagnetic wave has the shortest wavelength and the greatest energy?
A. B. C. D. E.
0 0 000
A. Radio waves.B. Visible light waves.C. Ultraviolet wave.D. Gamma rays.E. Help! I don’t
understand.
0of5
10
![Page 60: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/60.jpg)
60
Which wave on the EM spectrum has the lowest frequency and longest wavelength?
A. B. C. D. E.
0 0 000
A. Radio wavesB. X-raysC. Visible lightD. Ultra violetE. Help! I don’t
understand.
0of5
10
![Page 61: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/61.jpg)
61
Which wave on the EM spectrum has the highest frequency and shortest wavelength?
A. B. C. D. E.
0 0 000
A. Radio wavesB. X-raysC. MicrowavesD. Gamma RaysE. Help! I don’t
understand.
0of5
10
![Page 62: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/62.jpg)
62
What is the only EM wave humans can see?
A. B. C. D. E.
0 0 000
A. X-raysB. Ultra Violet raysC. Visible LightD. InfraredE. Help! I don’t
understand.
0of5
10
![Page 63: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/63.jpg)
63
Similarities Differences
Sound Waves vs. Electromagnetic Waves
Copy the below data table in your NB.Using your prior knowledge of sound , and new knowledge of EM waves. Fill in the below table.
![Page 64: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/64.jpg)
64
Focused free write
• Write a paragraph describing electromagnetic waves. You have 3 minutes to write.
• 3 min to use book or notes (if needed)
![Page 65: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/65.jpg)
65
• We are learning to: identify specific examples of electromagnetic waves.
• We are looking for: identify EM waves based on wavelengths and frequency:– Radio wave-longest wavelength; lowest frequency– Infrared– Visible light– Ultraviolet– x-ray– gamma rays-shortest wavelength; highest
frequency
![Page 66: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/66.jpg)
66
Properties of EM Spectrum
• Electromagnetic spectrum are transverse waves.
• These waves are not mechanical.
• All of these waves travel at the speed of 300,000 km/sec.
![Page 67: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/67.jpg)
67
Visible Light
• Visible light contains all of the colors of the spectrum.
• ROY G BIV• A rainbow refracts light
to break it down into the separate colors.
• Raindrops act as prisms to separate the colors.
![Page 68: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/68.jpg)
68
_________Wave _________Wave
Choose two waves from the electromagnetic spectrum and complete the Venn diagram .
![Page 69: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/69.jpg)
69
Standing Waves
• Standing wave is when the interference of the original wave with the reflected wave causes the medium to vibrate in a stationary pattern.
![Page 70: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/70.jpg)
70
Standing Wave
• Nodes are the areas of a standing wave where there are no vibrations.
• Antinodes are areas of a standing wave where there is maximum vibration.
![Page 71: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/71.jpg)
71
We are learning to: demonstrate that vibrations produce transverse waves which move away from the original source. We are looking for: an explanation of the following:
• A medium is not required• A light is produced• A vibration is required to produce light wave (transverse wave)
![Page 72: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/72.jpg)
72
Light as a Wave
• Light travels as transverse waves.
• Light does not require a medium.
• Light waves are called electromagnetic waves.
• The wave model is supported because light can reflect, refract and diffract.
![Page 73: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/73.jpg)
73
Light as a Particle
• In the particle model, light travel in photons.
• Photons are considered particles.
• Photons don’t have mass, they are bundles of energy.
![Page 74: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/74.jpg)
74
Frequency of Light
• The amount of energy is proportional to the frequency of the corresponding electromagnetic wave.
• A photon with twice as much energy corresponds to a wave with twice the frequency is in the ultraviolet range.
• A photon with half as much energy corresponds to a wave with half as much frequency is in the infrared range.
![Page 75: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/75.jpg)
Which type of wave is light?
75
A. B. C. D.
0 000
A. longitudinalB. transverseC. seismicD. surface
0of5
10
![Page 76: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/76.jpg)
Is light a mechanical wave?
76
A. B.
00
A. yesB. no
0of5
10
![Page 77: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/77.jpg)
Which travels faster, light or sound?
77
A. B. C.
0 00
A. lightB. soundC. Both light & sound
0of5
10
![Page 78: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/78.jpg)
Which theory explains how light travels?
78
A. B. C. D.
0 000
A. Particle theory.B. Wave Theory.C. Both Particle &
Wave Theories.D. Neither Particle or
Wave Theories.
0of5
10
![Page 79: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/79.jpg)
79
Write a paragraph describing a unique way in which light is used in
your everyday life.
![Page 80: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/80.jpg)
80
We are learning to: demonstrate transverse waves can be reflected off of a barrier.
We are looking for: how light is reflected off of a mirror:
•Law of Reflection.•Types of images:
•Real•virtual
•Types of mirrors:•Concave•Convex•Plane
![Page 81: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/81.jpg)
81
Reflection and Color
• Reflection occurs as light hits a barrier and bounces off of the barrier.
• The incidence ray is the incoming light waves.
• The reflected ray is the light waves that bounce off of the barrier.
![Page 82: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/82.jpg)
82
Reflection (continued)
• The angle of incidence is defined by the angle between the normal and the incidence ray.
• The angle of reflection is defined by the angle between the normal and the reflected ray.
• The law of reflection states that the angle of incidence is always equal to the angle of reflection.
![Page 83: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/83.jpg)
83
Types of Reflection
• Smooth reflection occurs when the light waves hit a smooth surface.
• Diffuse reflection occurs when the light waves hit a rough surface and the light waves are scattered.
![Page 84: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/84.jpg)
84
Types of Mirrors
• Concave mirrors are mirrors that curve inward. These type of mirrors can produce virtual & real images.
• Convex mirrors are mirrors that bulge outward. These type of mirrors can produce virtual images.
• Plane mirrors produce virtual images.
![Page 85: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/85.jpg)
85
Type of Images
• Real images are inverted images formed where rays of light meet.
• Virtual images are upright images formed where rays of light appear to meet or come from.
![Page 86: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/86.jpg)
86
Reflection Lab
• Complete the reflection lab using the light stations.
![Page 87: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/87.jpg)
87
We are learning to: demonstrate how light can be refracted as it goes through different mediums.
We are looking for: how light is refracted as it changes speed as it goes through different mediums.•Convex lens•Concave lens•prisms
![Page 88: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/88.jpg)
88
Refraction
• Refraction happens when light waves changes speed as it goes through different mediums.
• As light waves change speed the waves bend.
![Page 89: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/89.jpg)
89
Effects of Refraction
• Refraction makes objects appear to be in different positions.
• Refractions in the atmosphere creates mirages.
![Page 90: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/90.jpg)
90
Lenses
• A lens is a curved piece of glass.
• Lenses can magnify images.
• Magnification is any change in the size of an image compared with the size of the object.
![Page 91: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/91.jpg)
91
Type of Lenses
• Converging lens bends the light inward that produces a virtual or real image. (convex lens)
• Diverging lens bends the light outward and can produce only a virtual image. (concave lens)
![Page 92: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/92.jpg)
92
What causes light to refract?
Speed ch
anges
Medium ch
anges
Both A and B
Help, I need h...
0% 0%0%0%0of5
A. Speed changesB. Medium changesC. Both A and BD. Help, I need help!
10
![Page 93: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/93.jpg)
93
Which type of lens is used to focus light to one point?
Concave
lens
Convex lens
Prism
Help, I need h...
0% 0%0%0%
A. Concave lensB. Convex lensC. Prism D. Help, I need help!
0of5
10
![Page 94: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/94.jpg)
94
Why does a straw appear to be bent in a glass of water?
Refracti
on
Reflection
Diffraction
Help, I need h...
0% 0%0%0%
A. Refraction B. Reflection C. Diffraction D. Help, I need help!
0of5
10
![Page 95: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/95.jpg)
95
Free Write
• Using your book as a source of information, explain how lenses can be used to correct nearsightedness and farsightedness.
![Page 96: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/96.jpg)
Colors of the Visible Spectrum
• Red has the longest wavelength.
• Violet has the shortest wavelength.
96
![Page 97: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/97.jpg)
97
Colors are Reflected Light
• The color we see is the light being reflected from the object.
• Additive primary colors are red, green & blue.
• Subtractive primary colors are yellow, cyan and magenta.
![Page 98: SI Waves](https://reader035.fdocuments.us/reader035/viewer/2022062520/568161c5550346895dd1aaae/html5/thumbnails/98.jpg)
98
Colors and Pigments
• If all colors are reflected, you see white light.
• If all colors are absorbed, you see black.