Question

A man stationed between two parallel cliffs fires a gun. He hears the first echo after 1.5 s and the next after 2.5 s. What is the distance between the cliffs and when does the hear the third echo ? Take the speed of sound in air as 340 m//s.

Answer 1

Answer:

distance of man from first cliff= 1.5*340/2 =255 m

distance of man from second cliff= 2.5*340/2 =425 m

distance between two cliffs= 170m

he will hear the third echo after (1.5+2.5=4) 4 second when 1st and 2nd echo will again reach him after striking the opposite cliffs.

Explanation: