First slide

Travelling wave

Question

The echo of a gun shot is heard 8 sec after the gun is fired. How far from him is the surface that reflects the sound (velocity of sound in air = 350 m/s)

Easy

A

1400 m
B

2800 m
C

700 m
D

350 m

Solution

Suppose the distance between shooter and reflecting surface is d. Hence time interval for hearing echo is
$t = \frac{2 d}{v} \Rightarrow 8 = \frac{2 d}{350} \Rightarrow d = 1400 m .$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App