When a source is going away from a stationary \( \mathrm{P} \) obse...

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When a source is going away from a stationary
\( \mathrm{P} \) observer with the velocity equal to that of sound in

W air, then the frequency heard by observer is \( n \) times the original frequency. The value of \( n \) is
(1) 0.5
(2) 0.25
(3) 1.0
(4) No sound is heard
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