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.
Since speed of sound in air 344 m / s And speed of sound in aluminium 6420m / s we know that v distance/time therefore time d v/ time taken by sound wave in air/time taken by sound wave in aluminium d d / 344: / 6420 6420 / 344 18.66 /1 The sound will take 18.66 times more time through air than in aluminum in reaching other boys.
