A man standing $25$ m away from a wall produces a sound and receives the reflected sound. Calculate the time in seconds after which he receives the reflected sound if the speed of sound in air is $350$ $m s^{- 1}$ .

0.143

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0.25

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2.5

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1.52

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Solution

The correct option is A $0.143$
As the speed of sound is $350 m / s$ and the distance traveled by sound is $25 m$ are given in the question, the time taken is calculated from the formula,
$T i m e t a k e n = \frac{D i s t a n c e t r a v e l e d}{v e l o c i t y o f s o u n d}$ .
The total distance traveled by the sound is given as $2 \times 25$ m as it is a reflected sound.
The time taken for the reflected sound to reach the listener is $= \frac{2 \times 25 m}{350 m / s}$ = 0.143 seconds.

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A man standing 25 m away from a wall produces a sound and receives the reflected sound. Calculate the time in seconds after which he receives the reflected sound if the speed of sound in air is 350 ms−1.

A man standing $25$ m away from a wall produces a sound and receives the reflected sound. Calculate the time in seconds after which he receives the reflected sound if the speed of sound in air is $350$ $m s^{- 1}$ .