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To an observer, the pitch of a stationar...

To an observer, the pitch of a stationary source of sound appears to be reduced by 20%. If the speed of sound is 340m/s then speed and direction of the observer is

A

86 m/s towards the source

B

68 m/s towards the source

C

86 m/s away from the source

D

68 m/s away from the source

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The correct Answer is:
D
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AAKASH SERIES-WAVES-EXERCISE-II (Doppler Effect : )
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  2. A source of sound is travelling towards a stationary observer. The fre...

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  3. To an observer, the pitch of a stationary source of sound appears to b...

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  4. An observer moves towards a stationary source of sound with a velocity...

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  5. When both source and observer approach each other with a speed a equal...

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  6. An engine giving off whistle is moving towards a stationary observer w...

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  7. A train running at 108 km/hr towards east whistles at a frequency of 8...

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  8. A source and a detector move away from each other, each with a speed o...

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  9. Two trains are moving towards each other at speeds of 144 km/hr and 54...

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  10. A Car is travelling at (v)/(10) ms^(-1) and sounds horn of frequency 9...

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  11. A source is moving with a constant speed of 10 m/s on a circular track...

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  12. A car travels at a speed of 'a' towards a high wall. The driver sounds...

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  13. The wave length of the sound produced by a source is 0.8m. If the sour...

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  14. A person going away from a factory on his scooter at a speed of 36 km/...

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  15. A detector is released from rest over a source of sound of frequency f...

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  16. Two sources A and B are sounding notes of frequency 680 Hz. A listener...

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  17. source and observer both start moving simultaneously from origion one ...

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  18. An observer is standing 500 m away from a vertical hill. Starting betw...

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  19. A roller skater carrying a portable stereo skates at constant speed an...

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  20. A motorcycle starts from rest and accelerates along a straight path at...

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