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Question

Statement 1: Ram is standing at a distance of 33 m from a wall. He claps and hears the echo of his own clap.

Statement 2: Velocity of sound in air is 330 m/s and time of persistence for hearing is 110 of a second.

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Solution

The correct option is **B**

Statement 1 is true and information in statement 2 is sufficient to prove it

Time taken by the sound of Ram's clap to come back after reflection from the wall is the time taken for sound to travel a distance twice the distance between Ram and the wall. So, t=(2×33)330=15 s. Since t is greater than the time of persistence of hearing (110 s), Ram will hear the echo of his clap. So, statement 1 is true and information in statement 2 is sufficient to prove it.

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