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Is it true that for an echo to be heard, the reflected sound must reach the human ear in not less than $0.1 s$ ?

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True

False

answer is A.

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Detailed Solution

The above statement is true.
The distance between the sound source and the location from which it is reflected must be at least

17 metres

, and the time between hearing the original sound and its echo must be at least

0.1 seconds

. A site from which the sound is being reflected, such as walls, mountains, or water bodies, must be present in order to hear the echo because the human ear cannot distinguish between two sequential noises if there are less than

0.1 seconds

between them.
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