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An engine blowing a whistle of frequency...

An engine blowing a whistle of frequency 133 Hz moves with a velocity of `60(m)/(s)` towards a wall from which an echo is heard. Calculate the frequency of the echo heard by the driver. (velocity of sound in air in `340(m)/(s)`.)

A

190 Hz

B

161 Hz

C

133 Hz

D

113 Hz

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The correct Answer is:
C
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TARGET PUBLICATION-WAVE MOTION -MCQ 7.1
  1. A person is standing on a railway platform.An engine blowing a whistle...

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  2. Two aeroplanes A and B ,each moving with a speed of 720 km/hr. are mov...

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  3. An engine blowing a whistle of frequency 133 Hz moves with a velocity ...

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  4. A passenger is sitting in a fast moving train The engine of the train...

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  5. A source of sound and a listener both are moving in the same direction...

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  6. If a stationary observer notes a change of 25% in the frequency of a w...

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  7. A train A is travelling at a speed of 108 km hr^(-1) The train appro...

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  8. Two cars are approaching each other with same speed of 20 m//s . A ma...

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  9. An engine is moving on a circular track with a constant speed It .is b...

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  10. An engine driver moving towards a wall with a velocity of 60 m/s emit...

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  11. An object producing a pitch of 600 Hz approaches a stationary person i...

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  12. When both source and listener approach each other with a velocity equa...

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  13. The difference between the apparent frequency of a sound of soun as pe...

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  14. A wave is expressed by the equation y=0.5sinpi(0.01x-3t) where y a...

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  15. Two sources of sound A and B produce the wave of 350 Hz ,they vibrate...

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  16. A tuning fork whose frequency is given by the manufacturer as 512 Hz i...

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  17. Two sounding bodies producing prograssive waves given by y1 =4 sin (4...

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  18. A source of sound emitting a note of frequency 90 Hz moves towards an ...

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  19. A train has just completed a U-curve in a trach which is a semi circle...

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  20. Assertion :on reflection from a rigid boundary (denser medium) there i...

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