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  4. Ratio of radii of second and first Bohr orbits of H atom is:

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Q. Ratio of radii of second and first Bohr orbits of $H$ atom is:

JIPMERJIPMER 2005Structure of Atom

Solution:

According to Bohr rule, $r \propto n^{2}$
where $r$ is radii and $n$ is the number of orbit
So, $\frac{r_{1}}{r_{2}}=\frac{(2)^{2}}{(1)^{2}}=4$
Hence, ratio of radii is $4$