A plane sound waves passes from medium $1$ into medium $2$. The speed of sound in medium $1$ is $200\,m/s$ and in medium $2$ is $100 \,m/s$. The ratio of amplitude of the transmitted wave to that of incident wave is :-
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$a_{t}=\frac{2 v_{2}}{v_{1}+v_{2}} a_{i} \Rightarrow \frac{a_{t}}{a_{i}}=\frac{2 \times 100}{200+100}=\frac{2}{3}$
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