Question

A man stands at a distance of 68 m from a cliffand fires a gun. After what time

interval will he hear the echo, if the speed of sound in air is 340 m/s ? ​

Answer 1

Answer:

Answer. So echo is heard after 2t i.e. 0.2 x 2 = 0.4 sec.

Answer 2

0.4 seconds

Explanation:

Given,

340 m is covered in = 1 second

So, 68 m is covered in = 68/340 seconds

= 0.2 seconds

Now , the time by sound to travel from the an to the cliff = 0.2 seconds

And the time taken to travel from the cliff back to anyou = 0.2 seconds

Therefore, total time = 0.2 + 0.2 = 0.4 seconds