128.The frequency of the whistle of an engine appears to drop to 2/3rd of its actual value when it passes a stationary observer. Velocity of sound in air is 330m/sec then the speed of engine is

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Q. The pitch of the whistle of an engine appears to drop to

{(\frac{5}{6})}^{t h}

of original value when it passes a stationary observer. If the speed of sound in air is

350 m / s

then the speed of engine is

Q. The frequency of the whistle of an engine appears to be

{(\frac{5}{6})}^{t h}

of the original frequency , when it passes a stationary observer. If the speed of sound in air is

350 m/s

, then the speed of the engine is:

[Assume, medium is stationary and the original frequency of the whistle is measured when the source and observer are at rest]

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