03quiz_08

03quiz_08 - Physics 9B-C Quiz#3 Name ID-last 4 . (....

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Physics 9B-C Quiz #3 Name: 10/17/2008 ID-last 4: A woman stands at rest in front of a large smooth wall.  She holds a vibrating tuning fork of  frequency  fø  directly in front of her (between her and the wall.  The woman now runs toward the  wall with speed  v w .   Sound waves travel with speed  v a .   She detects beats due to interference  between sound waves reaching her directly from the fork and those reaching her after being  reflected from the wall.   a) (7 pts) How many beats per second will she hear?  Use    f L = v a ± v L v a v s f s toward away This involves a double Doppler shift.   The sound that arrives at wall and is reflected (R) is doppler shifted up in frequency because the  source, the woman (L) is moving toward wall (W).  Let the frequency of the tuning fork be
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