Question

An observer standing in front of a cliff fires a gun and hears its echo after 4 second. How much distance should he move from the cliffin order to hear echo in 1.2 second less time if velocity of sound in air is 330ms.



please help​

Answer 1

velocity=330m/s

time taken to hear echo=4 seconds

echo is reflection of sound

so,

therefore,

2 seconds were taken in reaching that distance

and another 2 seconds were taken for returning

distance(including the returning)=4*330

=1320 m

he wanted to hear echo in=(4-1.2)=2.8 seconds

so,

distance=velocity*time

distance=330*2.8

=924m

he have to walk

=(1320-924)/2

=396/2

=198m

hope it helps

:-)

Answer 2

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