A body shouts inside a deep well and hears the echo 0.4 s after shouting. if the speed of sound is 340 ms−1 find the depth of the water level in the well :
78 m
68 m
88 m
58 m
A
78 m
B
88 m
C
68 m
D
58 m
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Solution
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Let d be the distance of body from water level in well (depth of water level) , therefore total distance travelled by sound wave , =2d , as the wave comes back after reflection so the distance will be doubled .
Now given , v=340m/s,t=0.4s ,
therefore , by , total distance =velocity × total time
2d=v×t ,
or d=v×t/2=340×0.4/2=68m
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