Question

A boy receives his echo 3 sec later . Find the distance of the reflecting surface from the boy . Speed of in air is 342 m/s

Answer 1

Let the distance be d
since sound bounced back as an echo thus it covered the distance d twice
so,
distance =2d
time taken =3sec
speed=342m/s

distance=speed×time

2d= 342×3
2d = 1026
d= 1026/2
distance= 513 metres

ans.513 metres

Answer 2

Answer:

513 meters

Explanation:

Let the distance be d

since sound bounced back as an echo thus it covered the distance d twice

so,

distance =2d

time taken =3sec

speed=342m/s

distance=speed×time

2d= 342×3

2d = 1026

d= 1026/2

distance= 513 metres

ans.513 meters