Question
An observer stands at a distance of 850 m from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of 350 ms−1 in air?
Answer: Option A
:
A
Given, speed of sound, v=350 ms−1 and distance between the observer and the cliff, d=850 m.
This is a case of an echo, so distance travelled = 2d (because sound travels from the observer to the cliff and back to the observer)
We know, speed=distancetime
v=2dt
⇒t=2dv
=(2×850)350=4.86 s.
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:
A
Given, speed of sound, v=350 ms−1 and distance between the observer and the cliff, d=850 m.
This is a case of an echo, so distance travelled = 2d (because sound travels from the observer to the cliff and back to the observer)
We know, speed=distancetime
v=2dt
⇒t=2dv
=(2×850)350=4.86 s.
Was this answer helpful ?
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