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Question 8

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.

Answer

Speed of sound in air = 346 m/s

Speed of sound in Aluminium = 6420 m/s

Let the length of the aluminium rod = d.

Therefore, time taken by the sound wave to reach the other end,

Therefore, time taken by sound wave to reach the other end,

The ratio of time taken by the sound wave in air and aluminium:

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