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Frequency

A tuning fork...

Question

A tuning fork vibrates with 2 vibrations in 0.4 seconds. Its frequency (in Hz) is

A

5

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B

6

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C

8

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D

0.8

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Solution

The correct option is C 5
Number of vibrations $n = 2$
Time taken $t = 0.4$ s
Thus frequency of sound $ν = \frac{n}{t}$
$∴$ $ν = \frac{2}{0.4} = 5 H z$

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