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Oscillations

One tuning fo...

Question

One tuning fork vibrates at 238 Hz & second tuning fork vibrates at 242 Hz, then we get sound of frequency 240 Hz that go through maximum intensity ______ times every second.

A

4

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B

2

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C

3

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D

120

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Solution

The correct option is A 4
$B e a t f r e q u e n c y = n_{1} - n_{2}$
$β$ = Beat frequency = 242 - 238 = 4 Hz

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