Unit 9: Let Us Entertain You

Essential QuestionsWhat are the relationships among wavelength,

frequency, and speed of a wave?How are vibrations and pitch varied in a string

to produce different sounds?How does vibrating air produce sound?How do plane and curved mirrors affect the

image that is produced?How can the colour of an object appear to be

different by shining different colour light on it?

Chapter ChallengeYou will work with your partner to create a 2-4

minute light and sound show This can be performed “live” or shown as a video

Along with it, there will be a written report that explains the physics concepts used in the show and explains why each concept is important

The sound must come from instruments or noise makers you make yourself

Due date: Monday, June 3 (During exam time)

Day 1: Making WavesLearning Objectives:

Observe the motion of a pulseMeasure the speed of a waveObserve standing wavesInvestigate the relationship among

wave speed, wavelength, and frequency

Make a model of wave motion

StarterTsunamis are giant ocean waves caused by an

underwater earthquakeWaves can reach extremely high heights, for

example in Thailand (2004), the waves reached 30m

How does water move to make a wave?How does a wave travel?Time: 10 minutes

Video: Japan Earthquake

Activity 1Draw a picture of a wave that includes the

following terms: Amplitude Wavelength Crest Trough

Time: 15 minutes

Activity 2For you to do, pg. 327Steps #1-10Write down observations, record dataData table will be provided for you Make a concluding statement about the

relationship of frequency, wavelength and speed of a wave

Time: 45 minutes

Activity 3Discussion of results and conclusion Draw a picture that shows what happens to the

frequency of a wave if you increase or decrease the wavelength

Time: 10 minutes

HomeworkFor you to read, pg. 331Physics talk, pg. 333Physics to go, pg. 337 #1, 7, 10, 11, 12

Day 2: Sounds in StringsLearning Objectives:

Observe the effect of string length and tension upon pitch produced

Control the variables of tension and length Summarize experimental results Calculate wavelength of a standing wave Organize data in a table

StarterWhen the ancient Greeks made stringed

musical instruments, they discovered that cutting the length of the string by half or two-thirds produced other pleasing sounds.

How do guitarists or violinists today make different sounds?

Time: 10 minutes

Video: The Physics of Sound

Activity 1For you to do, pg. 340 in lab groupsSteps #1-7Record the data table and answer the

questions/observations to go along with the steps

Hand in 1/lab group at the end of the periodAll equipment is on back tableTime: 45 minutes

Activity 2 Physics to go, pg. 344 #7 There are wood blocks in the back storage area that have

strings on them Work with your lab group to produce different sounds and

answer the following: Explain how different sounds are being produced using

wavelength, frequency, pitch, and standing waves in your explanation

Describe how the instrument works using wavelength, frequency, and standing waves in your description

Hand in with the “for you to do” activity Time: 20 minutes

Homework Please take your roller coaster models homeFor you to read, pg. 343Physics to go, pg. 344 #1, 2, 3

Day 3: Sounds from Vibrating AirLearning Objective:

Identify resonance in different kinds of tubes Observe how resonance pitch changes with length

of tube Observe the effect of closing one end of the tube Summarize experimental results Relate pitch observations to drawings of standing

waves Organize observations to find a pattern

StarterThe longest organ pipes are about 11m long. A

flute, is about 0.5m long and makes musical sound in the same way.

How do a flute an organ pipes make sound?Time: 15 minutes

Video: Sound in pipes

Video: Fresh PrinceSeason 1, Episode 1Time: 13:51

Activity 1For you to do, pg. 347 Steps 1-3Data table is provided for youWrite a concluding statement about straw

length and the pitch obtainedTime: 20 minutes

Activity 2For you to do, pg. 347, steps 4-5Write a concluding statement about the

amount of water in the test tube and the sound you hear.

How can this be changed to use in your sound and light show? (i.e. what materials could you use?)

Time: 20 minutes

Activity 3Create an “instrument” that uses at least one

of the principles that we have discussed thus far Wavelength Frequency Pitch

Create an advertisement that tries to sell your instrument to the rest of the class

Time: 30 minutes

HomeworkPhysics Talk, pg. 348For you to read, pg. 349Physics to go, pg. 351 #1, 2, 3, 4

Day 4: Reflected Light (60 min)Learning Objectives:

Identify the normal of a mirror Measure angles of incidence and reflection Observe the relationship between the angle of

incidence and the angle of reflection Observe changes in the reflections of letters Identify patterns in multiple reflections

Day 5: Curved MirrorsLearning Objectives:

Identify the focus and focal length of a curved mirror

Observe virtual images in a convex mirror Observe real and virtual images in a concave

mirror Measure and graph image distance vs. object

distance for a convex mirror Summarize observations in a sentence

Day 6: Refraction of LightLearning Objectives:

Day 7: Colour