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32 - Standing Waves

# 32 - Standing Waves - Standing waves For next time Read...

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Standing waves For next time: Read: Chapter 16 Homework: Handout, problems 1, 4, & 10

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Doppler Effect • Change in frequency due to the motion of a source and/or a receiver o s vv ff ⎛⎞ ± = ⎜⎟ ⎝⎠ ± v = speed of sound, v o = speed of observer, v s = speed of source ± upper signs for motion toward the other ± lower signs for motion away from the other
Doppler Effect • Car drives by at 30 m/s with horn at 400 Hz. What is the drop in frequency of the horn? o s vv ff ⎛⎞ ± = ⎜⎟ ⎝⎠ approach s v = () 343 m/s 400 Hz 438 Hz 343 m/s 30 m/s ==

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Doppler Effect • Car drives by at 30 m/s with horn at 400 Hz. What is the drop in frequency of the horn? o s vv ff ⎛⎞ ± = ⎜⎟ ⎝⎠ receding s v f f = + () 343 m/s 400 Hz 368 Hz 343 m/s 30 m/s == + 70 Hz f =−
What would this sound like? A B C E D whistle whistle

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A B C E D whistle whistle The diagram shows various positions of a child in motion on a swing. A stationary whistle is blowing in front of the child. At which position will the child hear the highest frequency for the sound of the whistle? a. At B, moving toward C. b. At C, moving toward D. c. At D, moving toward E.
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32 - Standing Waves - Standing waves For next time Read...

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