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Echo

A man stands ...

Question

A man stands at a distance of 68 m from a cliff and fires a gun.
The time interval after which will he hears the echo is:

[Take the speed of sound in air is 340 m s-1]

A

0.1 s

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B

6.8 s

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C

0.4 s

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D

2.0 s

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Solution

The correct option is C
0.4 s

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