A source emits a sound of frequency of $400 Hz$, but the listener hears it to be $390 Hz.$ Then
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(c)Since apparent frequency is lesser than the actual frequency, hence the relative separation between source and listener should be increasing.
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An air column in a pipe, which is closed at one end, will be in resonance with a vibrating body of frequency $166 \,Hz$, if the length of the air column is .... $m$
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