The radius of 2^nd orbit of He^+ of Bohr's model is r_1 and that of fourth orbit of Be^3+ is represented as r_2. Now the ratio r_2/r_1 is x: 1. The…

The radius of $\displaystyle 2^{\text {nd }}$ orbit of $\displaystyle \mathrm{He}^{+}$ of Bohr's model is $\displaystyle r_1$ and that of fourth orbit of $\displaystyle \mathrm{Be}^{3+}$ is represented as $\displaystyle r_2$. Now the ratio $\displaystyle \frac{r_2}{r_1}$ is $\displaystyle x: 1$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$