Question 455: Waves

Question

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

Accepted Answer

$${{\Delta f} \over f} = {v \over C}$$
$$ \Rightarrow {{\left( {Beats} \right)/2} \over f} = {v \over C}$$
$$ \Rightarrow Beats = {{2fv} \over C} = 4$$

Answer

4

Answer

8

Answer

2

Answer

zero

Waves

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

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