A sound wave completes $20$ vibrations in $2.5 s$ . Its frequency will be equal to :

20 H z

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8 H z

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200 H z

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50 H z

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Solution

The correct option is A $8 H z$
We have,

$F r e q u e n c y = \frac{N u m b e r o f v i b r a t i o n}{T i m e t a k e n}$

It is given that the sound wave completes 20 vibrations in 2.5 seconds

Hence,

$F r e q u e n c y = \frac{20}{2.5} = 8 H z$

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