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A man sets his watch by the sound of a s...

A man sets his watch by the sound of a siren placed at a distance 1 km away . If the velocity of sound is `330 m//s`

A

His watch is set 3s faster

B

His watch is set 3s slower

C

His watch is set correctly

D

None of the above

Text Solution

Verified by Experts

The correct Answer is:
B
`Time = (Distance)/(Velocity) = (1000)/(330) = 0.03s`
Sound Will be heard after 3.03. So his watch is set 3s, slower.
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Knowledge Check

  • A man standing on a platform observes that the frequency of the sound of a whistle emitted by a train drops by 140 Hz. If the velocity of sound in air is 330 m//s and the speed of the train is 70 m/s , the frequency of the whistle is

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    B
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    C
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    D
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    A
    571 Hz
    B
    800 Hz
    C
    400 Hz
    D
    260 Hz

  • A car is approching a railway crossing at a speed of 72 kmph . It sounds a horn, when it is 800 m away, at 600 Hz . If the velocity of sound in air is 330 ms^(-1) . The apparent frequency as received by a man at rest near the railway track perpendicular to the road at a distance of 600 m from the crossing the

    A
    `653 Hz`
    B
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    C
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    D
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