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Physics of Sound

Oscillations
Waves
  1. Two sources P and Q produce notes of frequency 660 Hz each. A listener moves from P to Q with a speed of 1 ms–1. If the speed of sound is 330 m/s, then the number of beats heard by the listener per second will be
    1. zero
    2. 4
    3. 8
    4. 2
Correct Option: B

Δƒ
 -
v
ƒC

⇒
(Beats)/2
 =
v
ƒC

⇒ Beats =
2ƒv
 = 4
C


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