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Question

Explain why can echoes not be heard in a small room.

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Solution

A sound persists in our ear for 0.1s. At temperature 22C in air and speed of sound 344 m.s1, the total distance covered by sound between the point of generation and reflecting surface should be at least 344 m/s × 0.1s = 34.4 m.
Thus, the minimum distance between the point of generation and reflecting surface should be half of it i.e. 17.2m .
So, we cannot hear an echo in a small room as the minimum distance for the echo will not be satisfied. But we can hear an echo in a long gallery and big halls.

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