A sound wave has a frequency of $10$ kHz and wavelength $3$ mm. How much time will it take to travel $3$ metre?

0.1

sec

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1

sec

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10

sec

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0.01

sec

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Solution

The correct option is B $0.1$ sec
$V = f \times λ$
$= 10 \times 10^{3} \times 3 \times 10^{- 3} = 30$
$t = \frac{d}{v} = \frac{3}{30} = 0.1$ sec.

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