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Physics
Atoms
In Bohr model of hydrogen atom, the ratio of periods of revolution of an electron in n = 2 and n = 1 orbits is
2 : 1
4 : 1
8 : 1
16 : 1
$T \propto n^3 \Rightarrow \frac{T_2}{T_1}=\frac{2^3}{1^3}=\frac{8}{1}$