Question

1. Two children are at opposite ends of an aluminium rod. One strikes the end of
the rod with a stone. Find the ratio of times taken by the sound-wave in air and
in aluminium to reach the second child. (Take velocity of sound in aluminium as
6420 m s-1 and in air as 346 m s-1 at 25 °C.)
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Answer 1

Answer:

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