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Thermodynamic Processes

A fixed sourc...

Question

A fixed source of sound emitting a certain frequency appears as $f_{a}$ 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. The frequency of the source is

A

\frac{f_{r} + f_{a}}{2}

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B

\frac{f_{a} - f_{r}}{2}

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C

\sqrt{f_{a} f_{r}}

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D

\frac{2 f_{r} f_{a}}{f_{r} + f_{a}}

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Solution

The correct option is A $\frac{f_{r} + f_{a}}{2}$

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