Why will an echo not be heard when the distance between the source of sound and the reflecting surface is $10 m$ ?

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Solution

Echo will not be heard when the distance between the source of sound and the reflecting surface is $10 m$ because the least distance to hear an echo is $17 m$ .

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Why will an echo not be heard when the distance between the source of sound and the reflecting surface is 10m?

Echo will not be heard when the distance between the source of sound and the reflecting surface is 10m because the least distance to hear an echo is 17m.

Why will an echo not be heard when the distance between the source of sound and the reflecting surface is $10 m$ ?

Echo will not be heard when the distance between the source of sound and the reflecting surface is $10 m$ because the least distance to hear an echo is $17 m$ .