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Frequency

If a wave com...

Question

If a wave completes 20 vibrations in 2.5s, then its frequency is

A

20 Hz

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B

8 Hz

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C

200 Hz

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D

50 Hz

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Solution

The correct option is B 8 Hz
Frequency is the number of vibration per second.
So in this case the frequency of the wave is:
$f = \frac{20}{2.5} H z$ $= 8 H z$

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