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A Man Standing 825 Metres Away from a Cliff (Steep Rock) Fires a Gun. After How Long Will He Hear Its Echo ? Speed of Sound in Air is 330 M/S. - Science

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A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo ? Speed of sound in air is 330 m/s.

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We have to calculate time taken by the sound wave to reach the reflecting surface.

Given: Distance between the observer and reflecting surface d = 825 m
Velocity of sound ν = 330 m/s
We know the time taken by sound wave to reach the reflecting surface is,
t = 2d/ν
⇒ t = (2)(825)/330
⇒ t = 5 s
This is the required time.

Concept: Echoes
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Lakhmir Singh Science Class 9 Physics
Chapter 5 Sound
Long Answers | Q 63.3 | Page 208
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