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

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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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