Question

The wavelength of a sound wave is 40 cm and the time period is 0.0005 s. How many seconds will it take to travel a distance of 4 km?

A
5 s
B
11 s
C
7 s
D
16 s

Solution

The correct option is A 5 sGiven: Wavelength of sound wave, λ=40 cm=0.4 m Time period, T=0.0005 s Distance travelled, s=4 km=4000 m Let speed of sound wave be v. Speed of a wave is the product will be: v=λT v=0.4 m0.0005 s v=800 ms−1 Let the time taken for the wave to travel distance s be t. From definition of speed, v=st t=sv t=4000800=5 s

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