A sound wave has frequency of 2 kHz and wavelength 30 cm. It will travel a distance of 1.8 km in

0.3 s

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3 s

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0.03 s

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12 s

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Solution

The correct option is B 3 s
Frequency, $f = 2 k H z = 2000 H z$
Wavelength, $λ = 30 c m = 0.3 m$
Speed of sound wave, $v = λ f = 0.3 \times 2000 \Rightarrow v = 600 m / s$
Distance travelled by wave, $s = 1.8 k m = 1800 m$
Time, $t = \frac{D i s t a n c e}{V e l o c i t y} = \frac{s}{v} \Rightarrow t = \frac{1800}{600} = 3 s$
Hence, the correct answer is option (b).

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