A) 2
B) 4
C) 3
D) 5
Correct Answer: B
Solution :
According to Bohr rule, \[r\propto {{n}^{2}}\] where r is radii and n is the number of orbit So, \[\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{{{(2)}^{2}}}{{{(1)}^{2}}}\Rightarrow 4\] Hence, ratio of radii is 4
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