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Halliday 2 Cap 18 - P18 077

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    December 2018

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77. (a) Since the source is moving toward the wall, the frequency of the sound as received at the wall is     v 343 m/s  f =f = 467 Hz . = (440 Hz) v − vS 343 m/s − 20.0 m/s (b) Since the person is moving with a speed u toward the reflected sound with frequency f  , the frequency registered at the source is     343 m/s + 20.0 m/s v+u = (467 Hz) = 494 Hz . fr = f  v 343 m/s