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Question

A sound has a frequency of 1,000 Hz and a wavelength of 34 cm. How long will it take to travel 1 km?

A
4.94 s
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B
3.94 s
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C
1.94 s
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D
2.94 s
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Solution

The correct option is D 2.94 s
We have,
ν=1000 Hz
and
λ=34 cm=34100 m.
The wave speed is v=νλ=(1000s1)(34100m)=340 m/s
The time taken by the wave to travel 1 km is
t=sv=1 km340 m/s=1000 m340 m/s=2.94 s.

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