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  4. A source emits a sound of frequency of 400 Hz , but the listener hears its to be 390 Hz . Then

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Q. A source emits a sound of frequency of $ 400\, Hz $ , but the listener hears its to be $ 390\, Hz $ . Then

AMUAMU 2019

Solution:

Real frequency, $n=400\,Hz$
Apparent frequency , $n'=390\,Hz$
$n' <\,n$
So, the distance between the source and listener increases or the listener is moving away from source