A railway engine moving with a speed of (V) \( 60 \mathrm{~m} / \mathrm{sec} \) passes in front ...

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A railway engine moving with a speed of
(V) \( 60 \mathrm{~m} / \mathrm{sec} \) passes in front of a stationary listner. The real frequency of whistle is \( 400 \mathrm{~Hz} \). Calculate the apparant frequency heared by listner (a) when the engine is approaching the listener. (b) when the engine moving away from the listner \( (\mathrm{N}=340 \mathrm{~m} / \mathrm{sec}) \)
(1) \( 484 \mathrm{~Hz}, 340 \mathrm{~Hz} \)
(2) \( 220 \mathrm{~Hz}, 180 \mathrm{~Hz} \)
(3) \( 320 \mathrm{~Hz}, 155 \mathrm{~Hz} \)
(4) \( 400 \mathrm{~Hz} 330 \mathrm{~Hz} \)
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