Q. 124.5( 10 Votes )

Two childre

Answer :

Let, the length of aluminium rod is l.

Now, firstly we calculate the speed of sound in air.

We know that,

Speed of sound (in air) =

346 =

Time taken in air = (i)

Now, speed of sound in aluminium.

We know that,

Speed of sound (in aluminium) =

6420 =

Time taken in aluminium = (ii)

Now by dividing (i) and (ii), we get:

= 6420/346


Therefore, the ratio is 18.55:1

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