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.
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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:
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