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A sound source and listener are both sta...

A sound source and listener are both stationary and a strong wind is blowing. Is there a Doppler effect?

Text Solution

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`n.=n((VpmW)/(VpmW))=n`, i.e. there is no Doppler effect .
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Doppler Effect in Sound

In discussing Doppler effect, we use the word "apparent frequency". Does it mean that the frequency of the sound is still that of the source and it is some physiological phenomenon in the listener's ear that gives rise to Doppler effect ? Think for the observer approaching the source and for the source approaching the observer.

Knowledge Check

  • When source and detector are stationary but the wind is blowing at speed v_W , the apparent wavelength lamda' on the wind side is related to actual wavelength lamda by [take speed of sound is air as v]

    A
    `lamda'=lamda`
    B
    `lamda'=(v_W)/(v)lamda`
    C
    `lamda'=(v_W+v)/(v)lamda`
    D
    `lamda'=(v)/(v-v_W)lamda`

  • S_(1) : Source and observer both are stationary and wind is blowing in a direction from source to observer then observer detects an apparent increases in frequency. S_(2) : Beat frequency is defined as the difference of frequency of two sources. S_(3) : Pressure node is always a displacement node and pressure antinode is always a displacement antinode.

    A
    TFT
    B
    FTT
    C
    FFF
    D
    TTT

  • Assertion : There will be no Doppler effect,when both the source and listener are at rest and wind alone is blowing Reason :The blowing wind does not change the distance between the source and listener which is a must for Doppler effect.

    A
    Assertion is True Reason is True, Reason is a correct explanation for Assertion
    B
    Assertion is true,Reason is true, Reason is a not correct explanation for Assertion
    C
    Assertion is True ,Reason is False
    D
    Assertion is False but , Reason is True

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