Question

meera is shouting between 2 hills and hears echo after 0.5 sec and another after 1 sec find distance beteween 2 hils

Answer 1

Answer:

Speed of sound in air=320m/sec

Time from 1st hill = 0.5sec

Formula for echo=

d = (v*t)/2

d = (320*0.5)/2

d = 80 metres (this distance is between the first hill and the girl)

Time from the second hill=1 sec

Speed in air = 320m/sec

D = (v*t)/2

D = (320*1)/2

D = 160 metres (this distance is between the second hill and the girl)

Total distance(distance between two hills)

d +D

80 + 160= 240 metres