Unit 9: Let Us Entertain You
Feb 24, 2016
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