Question

give reason a person standing at a poin 12m from a wall that produces an echo will not hear it.
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Answer 1

Answer:

Explanation:

To hear an echo,the original sound and the reflected sound should be separated by a time interval of at least one tenth of a second. If two sounds occur within one-tenth of a second, you will not hear them as separate sounds. As a human ear cannot distinguish sounds if they are not separated by one-tenth of a second.

or

we know that to form an echo , the dist. to the reflector must be minimum at 7m , accordingly 14m dist. should be there for a distinct echo , as according to the question the dist. is 12m , it's obviously that the echo can't be heard by the boy , and the echo must form behind the boy

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