Two sources \(\text{P}\) and \(\text{Q}\) produce notes of frequency \(660~\text{Hz}\) each. A listener moves from \(\text{P}\) to \(\text{Q}\) with a speed of \(1\) m/s. If The speed of sound is \(330\) m/s, then number of beats heard by the listener per second will be:
1. \(4\)
2. \(8\)
3. \(2\)
4. zero
Subtopic:  Doppler's Effect (OLD NCERT) |
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