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A toy-car, blowing its horn, is moving with a steady spped of 5 m/s, away from a wall. An observer, towards whom the toy car is moving, is able to hear 5 beats per second. If the velocity of sound in air is 340 m/s, the frequency of the horn of the toy car is close to :

A

340 Hz

B

510 Hz

C

170 Hz

D

680 Hz

Text Solution

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The correct Answer is:
C
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ALLEN-WAVES AND OSCILLATIONS-Part-1(Exercise-05)[A]
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  8. The transverse displacement y(x, t) of a wave on a string is given by ...

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  13. A pipe of length 85 cm is closed from one end.Find the number of poss...

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  14. A train is moving on a straight track with speed 20 ms^(-1). It is blo...

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  15. A bat moving at 10 ms^(-1) towards a wall sends a sound signal of 8000...

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  16. A source of sound emits sound waves at frequency f(0). It is moving to...

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  17. A uniform string of length 20 m is suspended from a rigid support. A ...

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  18. A pipe open at both ends has a fundamental frequency f in air. The pip...

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  19. Two engines pass each other moving in opposite directions with uniform...

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  20. A toy-car, blowing its horn, is moving with a steady spped of 5 m/s, a...

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