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A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m/s. (b) Will the man be able to hear a distinct echo? Explain the answer.
A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m/s. (b) Will the man be able to hear a distinct echo? Explain the answer.
Class 10 | ICSE | Physics | Selina | Sound
A man standing 25 m away from a wall produces a sound and receives the reflected sound. (a) Calculate the time after which he receives the reflected sound if the speed of sound in air is 350 m/s. (b) Will the man be able to hear a distinct echo? Explain the answer.

(a) Velocity = Time / 2D

so, time= \(\frac{2\times 25}{350}\)

Hence,

Time = 0.143 seconds

(b) The reflected sound arrives at the guy 0.1 second after the initial sound, while the original sound lasts just 0.1 second. As a result, the guy was able to detect a unique echo.

i

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