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A train is moving on a straight track wi...

A train is moving on a straight track with speed `20ms^(-1)`. It is blowing its whistle at the frequency of `1000 Hz`. The percentage change in the frequency heard by a person standing near the track as the train passes him is (speed of sound `= 320 ms^(-1)`) close to :

A

0.18

B

0.24

C

0.06

D

0.12

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The correct Answer is:
D
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ALLEN-WAVES AND OSCILLATIONS-Part-1(Exercise-05)[A]
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  9. Statement-1: Two longitudinal waves given by equation y(1)(x,t)=2asin(...

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  10. A travelling wave represented by y=Asin (omegat-kx) is superimpose...

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

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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 20m is suspended from a rigid support. A sh...

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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 speed of 5 m//s, ...

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