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Q.

The radius of third stationary orbit of electron for Bohr's atom is R. The radius of fourth stationary orbit will be:

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a

$\frac{3}{4} R$

b

$\frac{9}{16} R$

c

$\frac{4}{3} R$

d

$\frac{16}{9} R$

answer is B.

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Detailed Solution

$r \propto \frac{n^{2}}{Z}$

$\frac{r_{4}}{r_{3}} = \frac{4^{2}}{3^{2}}$

$r_{4} = \frac{16}{9} R$

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The radius of third stationary orbit of electron for Bohr's atom is R. The radius of fourth stationary orbit will be: