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Question

If the wavelength of a sound wave is 40 cm and the time period T = 0.005 s, how many seconds will it take to travel 4 km?


A

5 seconds

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B

10 seconds

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C

20 seconds

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D

50 seconds

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Solution

The correct option is D

50 seconds


Given, wavelength = 40 cm = 0.4 m

time period = 0.005 s

Speed of the sound wave, v=wave lengthtime period=0.40.005=80 ms1

Now distance to be covered = 4 km = 4000 m

Hence, time taken to cover 4 km = distancespeed=400080=50 s


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