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

Condition to hear an echo:
The 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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Q. Why will an echo not be heard when the distance between the source of sound and the reflecting surface is

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

Q. The minimum distance between the source of sound and the reflecting surface necessary to cause echo is

Calculate the minimum distance between the source and reflecting surface so that an echo is heard.

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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?

Condition to hear an echo:The 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 is17m.

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

Condition to hear an echo:
The 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 $17 m$ .