(a) Suppose an observer moves at half the speed of sound toward a stationary source of sound...
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(a) Suppose an observer moves at half the speed of sound toward a stationary source of sound waves. By what factor does the observed frequency differ from the emitted frequency?
(b) By what factor does the observed frequency differ if, instead of the observer moving, the source moves toward the stationary observer at half the speed of sound?
(c) Why is there a difference?
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