Question

A girl claps and hears echo after reflection from a cliff which is 660 m away from her. If the velocity of sound is 330 m/s, calculate the time taken for hearing the echo.

Answer 1

Given

Velocity of time , v = 330 m/s

Distance from cliff to girl d , = 660 m

Time taken t, = ?

We know speed = Distance /time

t =. d /s or d/v

t =. 660 /330

= 2 s

Hope this help u

Answer 2

Explanation:

distance of cliff from the girl is 660m

velocity is 330 m/s

S = 2D/t { in echo the sound has to travel double distance i.e first to the cliff and then back to the girl }

t = 2D /S

t = 2* 660 / 330

t = 4s

hope it helps

THANK YOU