What would be the appropriate quantum number $n$ $A^{0}$ for circular orbits of radius $13.2$ $A^{0}$ in hydrogen?

6

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7

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5

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4

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Solution

The correct option is D $5$
Radius of orbit for quauntum number $n$ according to Bohr's Model is
$r_{n} = 0.529 \frac{n^{2}}{Z} A^{\circ}$
$⟹ 13.2 A^{\circ} = 0.529 n^{2} A^{\circ}$
$⟹ n = 5$

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