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31 - Sound & The Doppler Effect

# 31 - Sound & The Doppler Effect - Sound waves Reading...

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Sound waves Reading: 17.1-17.4 Homework: Chapter 17, Problems 6, 42, & 62

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Waves • result from periodic disturbance • same period (frequency) as source • characterized by –amp l i tude (how far do the “bits” move from their equilibrium positions) –pe r iod (how long does it take for each “bit” to go through one cycle) or frequency – wavelength (over what distance does the cycle repeat in a freeze frame) – speed (how fast is the energy transferred)
reeze Time easure wavelength ( λ ) and amplitude (A)

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Boxcars λ Units? Counting boxcars is like counting waves …
Follow a single point connect the dots position time

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Follow a single point What is the wavelength?
Summary SPACIAL TEMPORAL • Freeze time (snapshot) – amplitude and wavelength • Follow a single point – amplitude and period

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Problem: Points A and B are marked with pieces of yarn. How is each piece of yarn moving? B A a. A up and B down b. A down and B up c. Both down d. Both up e. A left and B right
Problem: Points A and B are marked with pieces of yarn. How is each piece of yarn moving? B A a. A up and B down b. A down and B up c. Both down d. Both up e. A left and B right

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You see waves rolling onto the beach and estimate the wavelength at about 3.0 m. You measure the time between wave crests at 0.50 s. What is the speed of the waves? 3.0 m v = ? AB v = λ / T but, 1/ T = f How long for the crest at A to reach B?
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31 - Sound & The Doppler Effect - Sound waves Reading...

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