A girl stands at a distance of 170 m in front of a high wall and claps. What will be the time interval when she hears its echo? $[S p e e d o f s o u n d = 340 m / s]$

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Solution

The correct option is A 1s
Speed of sound, v = 340 m/s
Distance between girl and wall, x = 170 m
The total distance covered by the sound wave is equal to the sum of the distance from girl to wall and from wall to girl.

Total distance covered, $s = x + x = (170 + 170) m = 340 m$
Time interval, $t = \frac{Total distance covered}{Speed of sound} = \frac{s}{v} = \frac{340}{340} = 1 s$
Hence, the correct answer is option (a).

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A girl stands at a distance of 170 m in front of a high wall and claps. What will be the time interval when she hears its echo? [Speed of sound=340m/s]

A girl stands at a distance of 170 m in front of a high wall and claps. What will be the time interval when she hears its echo? $[S p e e d o f s o u n d = 340 m / s]$