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Question

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
1s
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B
2s
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C
15s
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D
0.5s
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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=340m
Time interval, t=Total distance coveredSpeed of sound=sv=340340=1s
Hence, the correct answer is option (a).

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