When an observer moves toward a stationary source with a certain velocity, he observers an appar...

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When an observer moves toward a stationary source with a certain velocity, he observers an apparent frequency f. When it moves away from the source with same velocity, the observed frequency is \( 0.8 \mathrm{f} \). If the velocity of sound is \( \mathrm{v} \), then the speed of the observer is
(A) \( \frac{\mathrm{V}}{4} \)
(B) \( \frac{\mathrm{V}}{8} \)
(C) \( \frac{\mathrm{V}}{9} \)
(B) None of these
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