In terms of Bohr radius $a_{0}$ , the radius of the second Bohr orbit of a hydrogen atom is given by:

8 a_{0}

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4 a_{0}

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2 a_{0}

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\sqrt{2} a_{0}

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Solution

The correct option is B $4 a_{0}$
Since, $r \propto n^{2}$
Radius of $2^{n d}$ Bohr's orbit $= 4 a_{0}$ .

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