18. Waves & Sound
The Doppler Effect
Multiple Choice
Multiple ChoiceA police siren emits a sound somewhere around 700 Hz. If you are waiting at a red light, and a police car approaches you from behind and passes you, moving at a constant 30 m/s, what is the frequency you hear from the siren as it approaches you from behind? What about once it's passed you? Assume the air temperature to be 20°C.
A
fD,towards=639 m/s, fD,away=761 m/s
B
fD,towards=644 m/s, fD,away=767 m/s
C
fD,towards=761 m/s, fD,away=638 m/s
D
fD,towards=767 m/s, fD,away=644 m/s
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