Question

An observer stands at a distance of 850 m from a cliff fires witha gun after what time gap we will hear the sound of echo if the sound travels at 350 m / sec???

Answer 1

time gap after what he hear the sound of echo=time taken by sound to cover the distance (850×2)m
=1700/350
=48.57sec

Answer 2

Dear Student,

● Answer -

Sound of echo will be heard after 4.857 s.

◆ Explanation -

For echo to return back sound has to travel double the distance. i.e. 850×2 = 1700 m.

Time taken to hear the echo will be -

Time = distance / speed

Time = 1700 / 350

Time = 4.857 s

Hence, we will hear sound of echo after 4.857 s.

Thanks dear. Hope this is helpful to you...