Two children are at opposite ends of an aluminium rod. one strikes the end of road with stone. find the ratio of times taken by sound wave in air and in aluminium to reach the second child . ( given: speed of sound in air : 346 m/s , speed of sound in almunium = 6420 m/s
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Speed of sound in air = distane /time
346 = l/ time taken
time taken in air = l/ 346
speed of sound = distance / time
6420 = l/ time taken
time taken = l / 6420
Dividing 1 by 2nd equation
time taken by aound in air / time taken sound in almunium
l/ 346×6420/l
6420/346
18.55/1
The ratio of times taken by sound waves in air & in almunium to reach the 2nd child is 18.55:1
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