The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent frequency in cps heard by the observer will be

600

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1050

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1400

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2400

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Solution

The correct option is C 1400
$n^{'} = n (\frac{v}{v - v_{i}}) = 1200 \times (\frac{350}{350 - 50}) = 1400 c p s$

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The speed of sound in air at a given temperature is 350 m/s. An engine blows whistle at a frequency of 1200 cps. It is approaching the observer with velocity 50 m/s. The apparent frequency in cps heard by the observer will be

The correct option is C 1400 n′=n(vv−vi)=1200× (350350−50)=1400 cps

The correct option is C 1400
$n^{'} = n (\frac{v}{v - v_{i}}) = 1200 \times (\frac{350}{350 - 50}) = 1400 c p s$