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Q.

Can echoes be heard more than once?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
If we scream or clap near a suitable reflecting object, such as a tall building or a mountain, we will hear the same sound again. This sound is referred to as an echo. The phenomenon of sound wave reflection causes echoes. For a person standing at the source to hear the echo clearly, the reflecting object must be more than

17.2 m

away from the sound source.
Because of successive or multiple reflections of sound, echoes are heard more than once. The time interval between the original sound and the reflected sound should be at least

0.1 s

to hear a distinct echo. The minimum distance between the source of the sound and the reflecting surface for hearing a distinct echo is

17.2 m

.

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