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

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

NTA AbhyasNTA Abhyas 2022

Solution:

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