A sound wave having a wavelength of 20 cm is travelling in water. If the velocity of sound in water is $1600 m s^{- 1}$ , then find the frequency of the sound wave.

9000 Hz

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8000 Hz

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7000 Hz

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1600 Hz

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Solution

The correct option is B
8000 Hz

Given, the speed of the sound wave in water = $1600 m s^{- 1}$
and wavelength of sound wave = 20 cm = 0.2 m.
We know that, Speed of a wave $= F r e q u e n c y \times W a v e l e n g t h$
$F r e q u e n c y = \frac{s p e e d}{w a v e l e n g t h}$

$\Rightarrow \frac{1600}{0.2} = 8000 H z$

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