1. Calculate the minimum distance at which a person should stand in front of a reflecting surface to
be able to hear an echo (speed of sound in air = 350 m/s).
NUMERICAL
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Answer:
17m
Explanation:
The human ear can hear two sounds distinctly only if there is a time interval of 1 /10 seconds between them. Now, the speed of sound in the air at 20degree C is 340m/s, so the distance traveled in 1 /10 seconds will be:
Distance = Speed X time
=340× 1 /10 = 34m
Thus, it is possible to hear the echo at the minimum distance of
34 /2 = 17m between the source of the sound and reflecting surface.
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