When hydrogen atom is in its first excit

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Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

When hydrogen atom is in its first excited level, its radius is .... its ground state radius

Options:

Half

Same

Twice

Four times

Correct Answer:

Four times

Explanation:

$r \propto n^2$ . For ground state n = 1 and for first excited state n = 2.

$\frac{r_2}{r_1} = \frac{2^2}{1^2} = 4$

$\Rightarrow r_2 = 4 r_1$