ICSE Class 10 Physics 2018 Solved Paper
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A person is standing at the sea shore. An observer on the ship which is anchored in between a vertical cliff and the person on the shore fires a gun. The person on the shore hears two sounds, 2 seconds and 3 seconds after seeing the smoke of the fired gun. If the speed of sound in the air is 320 ms − 1
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Question : 56
Total: 78
the distance between the cliff and the observer on the ship.
Solution:
The time taken by sound to travel from observer to cliff and then from cliff to the man on sea shore = 3
Let the distance between the cliff and the observer on the ship = 'x
∴
= ( x + x + 640 ) m
= ( 2 x + 640 ) m
Speed = 320 m ∕ s
time = 3 seconds
∵ Distance = Speed × time
∴ ( 2 x + 640 ) = 320 × 3
2 x + 640 = 960
2 x = 960 − 640
2 x = 320
x =
= 160 m
Let the distance between the cliff and the observer on the ship = '
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