Atomic Structure | Physics JEE previous year questions with Solutions

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Q 31 :

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 $\frac{r_{2}}{r_{1}}$ is $x : 1$ . The value of $x$ is _________ [2023]

0%

(2)

$r \propto \frac{n^{2}}{z}$

$\frac{r_{{He}^{+}}}{r_{{Be}^{3 +}}} = \frac{2^{2} \times 4}{2 \times 4 \times 4} = \frac{1}{2}$

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