Question

A MAN FIRES A GUN 150 M FROM CLIFF , A SECOND MAN WHO IS STANDING 300 M FURTHER AWAY FROM THE CLIFF HEARS THE GUN 1SECOND AFTER HE SEES THE FLASH ,THE SECOND MAN WILL HEAR THE ECHO FROM THE CLIFF??
A) I SECOND AFTER SEEING THE FLASH
B)2 SECOND AFTER HEARING THE GUN
C) 2 SECONDS AFTER SEEING THE FLASH
D) 4 SECONDS AFTER HEARING THE GUN

Answer 1

The time is 2 seconds after hearing the gun.

Explanation:

Distance between the two person = 300 m

Time after which he heard the sound = 1 s

so speed = distance / time = 300 m/s

Now time for hearing echo = total distance travelled /speed

Total distance = 150 + 150 + 300 = 600 m  [from person A to cliff then back to person A  +  distance from person A to person ]

Time for hearing echo =  600 / 300 = 2 sec

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Answer 2

Explanation:

2s

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