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Beat Frequency

Two sound sou...

Question

Two sound sources when sounded simultaneously produce four beats in 0.25 second. The difference their frequencies must be

A

4

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B

8

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C

16

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D

1

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Solution

The correct option is A 16
We know that the beat is the frequency difference.
No. of beats $=$ frequency difference

$f r e q u e n c y = \frac{b e a t s}{t i m e}$

$= \frac{4}{0.25} = 16$

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