# A fixed source of sound emitting a certain frequency appears as f_(a) when the observer is apporoaching the source with upsilon_(0) and f_(r) wh

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A fixed source of sound emitting a certain frequency appears as f_(a) when the observer is apporoaching the source with upsilon_(0) and f_(r) when the observer recedes from the source with the same speed. The frequency of source is
A. (f_(r) + f_(a))/(2)
B. (f_(a) - f_(r))/(2)
C. sqrt(f_(a)f_(r))
D. (2f_(r)f_(a))/(f_(r) + f_(a))

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