Question

Two children are at opposite ends of an aluminium rod.One strikes the end of the rod with a stone. Find the ratio of time taken by the sound wave in air and in aluminium to reach the second child. Given:- velocity of sound in air and aluminium are 346ms-1 and 6420ms-1 respectively.

Answer 1

Let the length of the aluminium pipe be l
So, time taken by sound wave in aluminium = l/6420
time taken by sound wave in air= l/346.
So ratio of the time taken by the sound wave in air and aluminium= l/6420/l/346
=l/6420×346/l
=346/6420 =346:6420






u can further convert it to its simplest form.



















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