Ram is standing 165 m behind Shyam. Shyam is standing 'd' meters away from a wall in the same line. Ram claps and Shyam hears the clap two times at an interval of 2 seconds. Find the value of 'd'. (Assume velocity of sound to be 330 m/s)

165 m

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660 m

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330 m

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82.5 m

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Solution

The correct option is B
660 m

The first sound heard by Shyam is direct sound and second sound is the reflection of the sound from the wall. The time gap between two sounds is the time taken by the sound to go to the wall and come back after reflection. So sound travels twice the distance 'd' in 2 seconds.
Hence, 165 + 2d = 2 $\times$ 330 = 660 m.
Thus, d = 247.5m.

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Ram is standing 165 m behind Shyam. Shyam is standing 'd' meters away from a wall in the same line. Ram claps and Shyam hears the echo of clap after 2 seconds he heard sound of direct clap. Find the value of 'd'. (Assume speed of sound to be $330 m s^{- 1}$ )

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