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Q.

Radius of the first excited state of Helium ion is given as : a₀→ radius of first stationary state of hydrogen atom.

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a

$r = 4 a_{0}$

b

$r = \frac{a_{0}}{4}$

c

$r = 2 a_{0}$

d

$r = \frac{a_{0}}{2}$

answer is D.

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Detailed Solution

$r = a_{0} \frac{n^{2}}{Z} = a_{0} \cdot \frac{(2)^{2}}{2} = 2 a_{0}$

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