Question

A girl stands at a distance of 170m in front of a high wall and claps.What will be the time interval when she hears its echo? Speed of sound =340m/s​

Answer 1

Answer:

1 second

Explanation:

Given:

• Distance between the girl and the wall (d) = 170 m

• Speed of sound (s) = 340 m/s

To find:

Time taken to hear the echo (t)

Method to find:

s = 2d/t  

(Speed of echo is equal to the twice of distance between surface                               and source divided by time)

⇒ 340 = (2*170)/t

⇒ 340 = 340/t

⇒ t = 340/340

⇒ t = 1 second

Hence, she will hear the echo after 1 second. Hope it helps!