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A person going away from a factory on his scooter at a speed of 36 km/hr listens to the siren of the factory. If the actual frequency of the siren is 700 Hz and a wind is blowing along the direction of the scooter at 36 km//hr, find the observed frequency heard by the person. (Given speed of sound `= 340 m//s`)

A

680 Hz

B

510 Hz

C

640 Hz

D

600 Hz

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-WAVES-EXERCISE-II (Doppler Effect : )
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  2. When both source and observer approach each other with a speed a equal...

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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  18. The driver of a car treavelling with speed 30 ms ^(-1) toward a hill ...

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  19. A siren emiting a sound of frequency 800 Hz moves away from on obsever...

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  20. The two harmonics of a tube closed at one end and open at other are 20...

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