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Q.

The ratio of the radii of the first three Bohr orbit in H atom is

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a

1 : 4 : 9

b

1 : 2: 3

c

1 : 8 : 27

d

$1 : \frac{1}{2} : \frac{1}{3}$

answer is C.

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Detailed Solution

$r_{n} \propto n^{2}$

Thus ratio of first three Bohr orbit is

$r_{1} : r_{2} : r_{3} = 1^{2} : 2^{2} : 3^{2} = 1 : 4 : 9$

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