Time taken to hear the echo — task. Science CBSE Homework Assignments, Class 9.

A boy stands at a distance of \(165\ m\) from a cliff. He claps his hand and hears an echo. If the speed of sound in air is \(330\ m/s\), after how long does he hear the echo?

\(1\ s\)
\(0.5\ s\)
\(2\ s\)
\(4\ s\)

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1. Time taken to hear the echo

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