Physics, asked by Thunder111, 1 year ago

A man standing in front of a wall produces a sound and hears an echo after 3s. He walks x km away from the wall and produces the same sound. Now he hears an echo after 5.25s. Calculate the distance he walked away from the wall. (Speed of sound in air is 340 m/s).

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Answered by skh2

Hope this will be helping you

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skh2: put the time given in place of t you will get your answer

Thunder111: answer is 450 m.

Thunder111: as in the book

skh2: so, 450 = 750t

Thunder111: how

skh2: t =450/750 = 3/5 = 0.6sec

Thunder111: thanks

skh2: so time must be 0.6sec given

Thunder111: actually it isn't

Thunder111: A man standing between two cliffs fires a gun and hears an echo every second. The distance of the man from the cliff is 175 m. Calculate the speed of sound and the distance between the cliffs.

Answered by bittuchahal1307

Let d be the distance initially from the man to wall

Then,2×d=340×3;we get d=510m

Now he moves away by x metre , let D be the new distance

Then 2×D=340×5.25;we get D =892.5

Hence he moved(892.5-510)=382.5m away

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