Multiple choice question XXXIX — task. Science CBSE, Class 9.

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An observer stands at a distance of \(850\ m\) from the cliff and fires a gun. After what time gap will he hear the echo, if sound travels at a speed of \(350\ ms^{−1}\) in air?

\(6.89\ s\)
\(4\ s\)
\(2.43\ s\)
\(4.86\ s\)

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