Question

There are three sources of sound of equal intensity with frequency 200 Hz, 201 Hz and 202 Hz
rEspectively, if all sounded simultaneously, then
beat frequency heard by listener is
(2) 3
(4) 4
(1) 2
(3) 1​

Answer 1

Answer:

Total beat frequency heard by the listener is 2 beats per second

Explanation:

When first and second source is sounded together then beat frequency is given as

$f_b = f_2 - f_1$

$f_b = 201 - 200$

$f_b = 1$ beats per second

When second and third source is sounded together then beat frequency is given as

$f_b = f_3 - f_2$

$f_b = 202 - 201$

$f_b = 1$ beats per second

When first and third source is sounded together then beat frequency is given as

$f_b = f_3 - f_1$

$f_b = 202 - 200$

$f_b = 2$ beats per second

So overall will have 2 beats per second

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Topic : Beats

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