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Q.

In Bohr’s model of hydrogen atom, if atomic radius of the first orbit is x, then the radius of the 3rd orbit will be

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a

$\frac{x}{3}$

b

$3 x$

c

$9 x$

d

$6 x$

answer is C.

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Detailed Solution

$r_{n} = r_{0} \frac{n^{2}}{Z}$

$r_{n} = x \times \frac{(3)^{2}}{1}$

$= 9 x$

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