Question
A person claps his hands in an empty room. He heard the echo of the sound after 5 seconds. What is the distance between the source of the sound and the reflecting surface, if the speed of sound in air is given as 340 ms−1?
Answer: Option C
:
C
Let, the distance between the source of sound and the reflecting surface be d
Hence, total distance the sound travels is: d′=2d
Given,
Time taken for the echo to reach the source, t=5 s
Speed of the sound wave, v=340 ms−1
From formula of speed,
v=2dt
5=2d340
⟹d=850 m
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:
C
Let, the distance between the source of sound and the reflecting surface be d
Hence, total distance the sound travels is: d′=2d
Given,
Time taken for the echo to reach the source, t=5 s
Speed of the sound wave, v=340 ms−1
From formula of speed,
v=2dt
5=2d340
⟹d=850 m
Was this answer helpful ?
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