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If a stationary observer notes a change of 25% in the frequency of a while of an engine coming towards him then the velocity of the engine is )(velocity of sound =332 m/s )

A

66.4 m/s

B

64 m/s

C

60 km/hr

D

32 km /hr

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The correct Answer is:
B
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TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
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  3. A source of sound and a listener both are moving in the same direction...

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  4. If a stationary observer notes a change of 25% in the frequency of a w...

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  6. Two cars are approaching each other with same speed of 20 m//s . A ma...

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  7. An engine is moving on a circular track with a constant speed It .is b...

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  8. An engine driver moving towards a wall with a velocity of 60 m/s emit...

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  9. An object producing a pitch of 600 Hz approaches a stationary person i...

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  10. When both source and listener approach each other with a velocity equa...

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  11. The difference between the apparent frequency of a sound of soun as pe...

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  12. A wave is expressed by the equation y=0.5sinpi(0.01x-3t) where y a...

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  13. Two sources of sound A and B produce the wave of 350 Hz ,they vibrate...

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  15. Two sounding bodies producing prograssive waves given by y1 =4 sin (4...

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  16. A source of sound emitting a note of frequency 90 Hz moves towards an ...

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  17. A train has just completed a U-curve in a trach which is a semi circle...

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  18. Assertion :on reflection from a rigid boundary (denser medium) there i...

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