Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a...

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Waves Waves Parts, Types, and Interactions

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Transcript of Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a...

Page 1: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

WavesWaves

Parts, Types, and Interactions

Page 2: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Definition of a WaveDefinition of a Wave

A disturbance that travels through a medium from one location to another location.

Waves transfer energy from one place to another.

Page 3: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Longitudinal WavesLongitudinal Waves

Medium travels parallel to direction of wave propagation. (sound, p-waves)

Page 4: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Transverse WavesTransverse Waves

Medium travels perpendicular to direction of wave propagation. (light, s-waves)

Page 5: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Types of WavesTypes of Waves

Page 6: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Water Waves (swell)Water Waves (swell)

Water waves are the superposition of longitudinal and transverse motions of water molecules.

Individual water molecules travel in circles.

Page 7: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave ParametersWave Parameters

Wavelength  ()        length or size of one oscillation

Amplitude (A)          strength of disturbance (intensity)

Frequency (f)    repetition

Page 8: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave ParametersWave Parameters

Page 9: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave PropertiesWave Properties

Waves are oscillations that transport energy. The energy of a wave is proportional to its

frequency. Fast oscillation = high frequency = high energy

Slow oscillation = low frequency = low energy The amplitude is a measure of the wave intensity.

SOUND: amplitude corresponds to loudness

LIGHT: amplitude corresponds to brightness

Page 10: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

WavelengthWavelength Measure from any identical two successive points

5 10 15 20 25 30 35 40

Page 11: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

WavelengthWavelength Measure from any identical two successive points

5 10 15 20 25 30 35 40

30 - 10 = 20

Page 12: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

WavelengthWavelength Measure from any identical two successive points

There are 4 complete oscillations depicted here ONE WAVE = 1 COMPLETE OSCILLATION

5 10 15 20 25 30 35 40

22.5 - 2.5 = 20

Page 13: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

FrequencyFrequency

Frequency = number of WAVES passing a stationary point per second (Hertz)

Page 14: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Remember…Remember…

Frequency (f) = number of oscillations passing by per second

Period (T) = length of time for one oscillation

T = 1/f f = 1/T

Page 15: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave SpeedWave Speed

Wave speed depends on wavelength and frequency:

v = f

Which animal can hear a shorter wavelength?

Cats (70,000 Hertz) or Bats (120,000 Hertz)

= v/f

Page 16: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave SpeedWave Speed

= v/f

Higher frequency = shorter wavelength

Lower frequency = longer wavelength

Page 17: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave InterferenceWave Interference

Waves add constructively.

Page 18: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave InterferenceWave Interference

Waves add constructively.

Page 19: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave InterferenceWave Interference

Waves cancel destructively.

Page 20: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave InterferenceWave Interference

Waves oscillate “out of phase”.½ wavelength phase shift

Page 21: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Wave InterferenceWave Interference

Page 22: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Waves at a BoundaryWaves at a Boundary

Reflection: waves “bounce” off barrier.

Page 23: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Waves at a BoundaryWaves at a Boundary

Reflection: Waves will always reflect in such a way that the angle at which they approach the barrier equals the angle at which they reflect off the barrier

Page 24: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Waves at a BoundaryWaves at a Boundary

Refraction of waves involves a change in the direction of waves as they pass from one medium to another

Page 25: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Waves at a BoundaryWaves at a Boundary

Diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.

Page 26: Waves Parts, Types, and Interactions. Definition of a Wave A disturbance that travels through a medium from one location to another location. Waves transfer.

Waves at a BoundaryWaves at a Boundary

animations


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