6.21 Questions.docx

# 6.21 Questions.docx - 1 A whistle you use to call your...

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1. A whistle you use to call your hunting dog has a frequency of 21 kHz, but your dog is ignoring it. You suspect the whistle may not be working, but you can't hear sounds above 20 kHz. To test it, you ask a friend to blow the whistle and hop on his moped. In which direction should he ride (toward or away from you) to know if the whistle is working? Explain in words or with a diagram. The friend should ride away from me so the wavelength increases. The frequency then decreases so that i am able to hear the sound coming from the whistle. 2. While standing near a bus stop, a student hears a distant horn beeping. The frequency emitted by the horn is 440 Hz. The bus is traveling at 20.0 m/s, and the speed of sound is 330 m/s. What frequency will the student hear at each point in the bus's motion? A. 468 Hz while approaching, 440 Hz through the crossing, 415 Hz while receding B. 415 Hz while approaching, 440 Hz through the crossing, 468 Hz while receding C. 440 Hz while approaching, 415 Hz through the crossing, 400 Hz while receding D. 505 Hz while approaching, 440 Hz through the crossing, 438 Hz while

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• Spring '14
• Work, 20.0 m/s, Kylie, 330 m/s, 16.5 m/s, 22.3 m/s

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