Question

A personstanding between two vertical clips and switch it away from the nearest clip shouted he heard the first echo after first second and the second 3 second letter calculate a the speed of sound in air and the distance between the two clips

Answer 1

Answer:

 Given: Distance from nearest pillar = 640 m

time taken to hear the echo = 4 sec

we know ,

velocity = Distance / time

            = 2 * Distance /time

(note:- (2 * Distance)  because Echo travels twice the Distance )

            = (640* 2 )/ 4

            =320( m / s )

 (i) velocity of sound = 320 ( m/s )

now (ii)

Distance between Person & Piller 2

2*Distance = velocity * time

2*Distance = 320 * 3

Distance = ( 320 * 3 ) / 2

= 480 m

Distance between 2 pillars = 640 + 480 =1120