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An observer starts moving with uniform a...

An observer starts moving with uniform acceleration `a` towards a stationary sound source emitting a whistle of frequency `n`. As the observer approaches source, the apparent frequency, head by the observer varies with time as

A

B

C

D

Text Solution

Verified by Experts

The correct Answer is:
B
For observer approaching a stationary source
`n'=(v+v_0)/(v)n` and given `v_0=atimplies n'=((an)/(v))t+n` This is the equation of straight line with positive intercept `n` and positive slope `((n)/(v))`.
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Knowledge Check

  • An observer starts moving with unifrom acceleration a towards a stationary sound soure of frequency f_(o) . As the observer approaches the source ,the apparent frequency f heard by the observer varies with time t as

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  • If an observer is moving with uniform velocity v to wards a stationary source of frequency n, and if the velocity of sound in the medium is V, then the apparent change in the frequency of the sound, heard by the observer, is -

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    `(vn)/(V)`
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    `(Vn)/(V-v)`
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    Apparent frequency will be less than the real frequency
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    Apparent frequency will be greater than the real frequency
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    Apparent frequency will be equal to real frequency
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    Only the quality of sound will change

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