A fixed source of sound emitting a certain frequency appears as \( \mathrm{f}_{\mathrm{a}} \) wh...

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A fixed source of sound emitting a certain frequency appears as \( \mathrm{f}_{\mathrm{a}} \) when the observer is approaching the source with speed \( v \) and frequency \( f_{r} \) when the observer recedes from the source with the same speed.
\( \mathrm{P} \) Find the frequency of the source.

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