The effect of a given sound lasts on a human ear for about 0.1 second.Use this fact along with the knowledge of speed of sound to estimate for getting a clear and a distinct echo?

Answers (1)
S safeer

Speed of sound=340m/s

Total distance travelled by the sound = 2d

 the minimum distance of the reflecting object=d

2d=340x0.1=34m

d=34/2=17m

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