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The frequency of the whistle of an engin...

The frequency of the whistle of an engine is heard by a passenger on the platform first increases and then decreases. The motion of the engine and passenger is described by -

A

The engine and the passenger are both approaching each other

B

The engine is approaching the passenger and then receding away from him

C

The engine and passenger are both moving away from each other

D

The engine is approaching the passenger, while the passenger is receding from it

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The correct Answer is:
B
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MOTION-SOUND WAVES-Exercise - 2
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  2. There are 26 tuning forks arranged in the decreasing order of their fr...

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  3. The frequency of the whistle of an engine is heard by a passenger on t...

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  4. The wavelength of a line of the spectrum of any star as seen by the ob...

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  5. The sun is rotating about its own axis. The spectral lines imitted fro...

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  6. An observer moving towards a stationary source observes that the appar...

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  7. If the velocity of sound is V, velocity of the observer is V(0) and ...

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  8. When a source of frequency n is receding away from a stationary observ...

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  9. A source is approaching a stationary observer with uniform acceleratio...

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  10. A star, emitting green light, is approaching the earth with uniform ac...

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  11. A man stands at rest in front of a large smooth wall. Directly in fron...

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  12. A whistle is rotated with 2 rotations/sec in a circle of radius 1 mete...

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  13. {:(overset(*)(A),overset(*)(S(1)),overset(*)(B),overset(*)(S(2)),overs...

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  14. A person is standing at distance of r from a source of sound. The freq...

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  15. If the wavelength of light emitted by a star is shifted towards red en...

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  16. Two whistles Aand B produces notes of frequencies 660 Hz and 596 Hz re...

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  17. The frequency of a radar is 780 MHz. After getting reflected from an a...

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  18. If a source sounding a whistle with a constant frequency moves in a ci...

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  19. A band playing music at a frequency f is moving towards a wall at a sp...

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  20. An engine giving whistle is moving towards a stationary observer with ...

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