The time period of a sound wave is $0.020 s$ . What is the frequency of vibration?

50 H z

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40 H z

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20 H z

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100 H z

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Solution

The correct option is A $50 H z$
Given:
Time period of vibration, $T = 0.020 s$

The frequency of a wave is equal to the inverse of time period.
i.e. $f = \frac{1}{T}$
$f = \frac{1}{0.020} = 50 H z$

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