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

A train is moving on a straight track with speed `20 ms^(-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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  2. A sound absorber attenuates the sound level by 20 dB. The intensity de...

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  3. While measuring the speed of sound by performing a resonance column ex...

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  4. A wave travelling along the x-axis is described by the equation v(x, t...

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  5. Three sound waves of equal amplitudes have frequencies (v -1), v, (v +...

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  6. A motor cycle starts from rest and accelerates along a straight path a...

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  7. The equation of a wave on a string of linear mass density 0.04 kg m^(-...

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  8. The transverse displacement y(x, t) of a wave on a string is given by ...

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  9. Statement I Two longitudinal wave given by equations y(1)(x,t)=2asin(o...

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  10. A travelling wave represented by y (x, t) = nsin(kx - omegat) is super...

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  11. A cylindrical tube, open at both ends, has a fundamental frequency f i...

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  12. A sonometer wire of length 1.5 m is made of steel. The tension in it ...

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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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