The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)

600 cps

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660 cps

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990 cps

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330 cps

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Solution

The correct option is B
660 cps

n' = n $(\frac{v}{v - v_{s}}) = 600 (\frac{330}{300}) = 660 c p s$

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The frequency of a whistle of an engine is 600 cycles/sec is moving with the speed of 30 m/sec towards an observer. The apparent frequency will be (velocity of sound = 330 m/s)

The correct option is B 660 cps n' = n (vv−vs)=600(330300)=660cps

The correct option is B
660 cps

n' = n $(\frac{v}{v - v_{s}}) = 600 (\frac{330}{300}) = 660 c p s$