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Two strings A and B are connected togeth...

Two strings `A` and `B` are connected together end to end as shown in the figure. The ratio of mass per unit length `(mu_(B))/(mu_(A))=4`. The tension in the string is same. A travelling wave is coming from the string A towards string B. if the fraction of the power of the incident wave that goes in sting B is `(n)/(9)` the value of n is:

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The correct Answer is:
8
`A_(T)=(2V_(B))/((V_(A)+V_(B))) A_(1)=(2sqrt(T/(m_(B))))/(sqrt(T/(mu_(A)))+sqrt(T/(mu_(B))))A_(1)=2/3A_(1)`
`(P_(t))/(P_(i))=(At^(2))/(Ai^(2)) sqrt((mu_(B))/(mu_(A)))=8/9`
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