Question

How will you calculate the minimum distance for an echo?
Plzzz Iska answer bta do.......

Answer 1

Time is 0.1sec. Speed in air = 340m/s

So, applying d = Vt/2

=> d = 340*0.1/2

=> d = 34/2

=> d = 17m

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Answer 2

for hearing echo the minimum distance of the obstacle from the source of the sound must be half of total distance covered by point of generation to reflecting surface of sound.