Question

why can you not hear the echo if you stand 10m away from the wall and shout towards it

Answer 1

This is because of the minimum distance to hear an echo (which is 17m).

Suppose, speed of sound in air is 340m/s.
The minimum time taken by an average human to hear an echo is 0.05 s
Since,
S = v*t
Wherein S is distance, v is speed (or) velocity, t is time
Therefore,
S = 340*0.05
S = 17m
Therefore we can conclude that the minimum distance to hear an echo is 17m.

But all of this also depends on the quality of sound (e.g. It would be hard to hear the echo of chirps of birds compared to a gunshot)

Answer 2

Answer:

To hear the eco we need to stand at least 17m away from the object.

Explanation:

Hope it helps.

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