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Two children are at opposite ends of an ...

Two children are at opposite ends of an aluminium . One strikes the end of the rod with a stone . Find the ratio of time takes by the sound wave in air and in aluminium to reach the second child.

Text Solution

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`V_(1) = 346m//s " "V_(2) = 6240m//s`
Length of aluminium rod = x m
Speed `= ("distance")/("time ") " " :. " time "=("distance")/("speed")=(x)/(346)` sec
Time taken in aluminium `=x/6420` sec
Required ratio `=((x)/(346))/(x/6420)=(x)/(346)xx(6420)/(x) =18.55`
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