NEET2013Physics-Waves
NEET 2013 Physics Doppler Effect MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 m s⁻¹. If the speed of sound is 330 m/s, the number of beats heard by the listener per second will be:
A
4
B
8
C
2
D
zero
Correct Answer
Option A
Detailed Explanation
The beat frequency is the difference in frequency heard by the listener. Since the listener is moving towards one source and away from the other, the effective frequency difference is 4 Hz.
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