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A train approaching a railway platform w...

A train approaching a railway platform with a speed of `20ms^(-1)` starts blowing the whistle. Speed of sound in air is `340ms^(-1)`. If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing on the platform will appear to be

A

600 Hz

B

640 Hz

C

680 Hz

D

720 Hz

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Knowledge Check

  • A train approaching a railway platform with a speed of 20 ms^(-1) starts blowing the whistle. Speed of sound in air is 340 ms^(-1). If the frequency of the emitted sound from the whistle is 640 Hz, the frequency of sound to a person standing of the platform will appear to be

    A
    600 Hz
    B
    640 Hz
    C
    680 Hz
    D
    720 Hz

  • A whistle whose air column is open at both ends has a fundamental of 5100 Hz . If the speed of sound in air is 340m* s^(-1) , the length of the whistle in cm, is

    A
    `5 //3`
    B
    `10//3`
    C
    5
    D
    `20//3`

  • 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
    `12%`
    B
    `18%`
    C
    `24%`
    D
    `6%`

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