A child hear an echo from a cliff 10 seconds after the sound from a powerful cracker is produced . how far away is the cliff from the child ? (velocity of sound in air as 350 m/s).
Velocity of sound, v = 350 m/s
Time taken by the sound to return from the cliff, t = 10 s
Let, x be the distance between the cliff and the boy.
= 3500m
=> x = 1750 m