Question

an echo of a sound is reard after 3 sec find the distance of the reflecting surface from the source if the speed of sound in air is 340 m/s

Answer 1

time,t=3 sec
speed of sound in air = 340 m/s
speed = distance/time
→distance = speed × time
distance = 340×3=1020 m
this is the distance travelled twice by sound.
The distance travelled of the reflecting sound = 1020/2=510 m

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Answer 2

time taken = 3 sec
speed of sound = 340 m/s

speed = distance/time
340 = distance/3
distance = 340×3
distance = 1020m

this is the distance traveled by sound from source to obstacle to again source.

the distance covered by sound in one round=1020/2 = 510 m

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