Question

The Bohr orbit radius for the hydrogen atom ( n= 1) is approximately 0.530 $A^{\circ }$. The radius for the first excited state (n=2) orbit is:

• A. 0.13 A^∘
• B. 1.06A^∘
• C. 4.77A^∘
• D. 2.12A^∘

Answer 1

The correct option is D

2.12A^∘

$1^{st}$ excited state means n=2

$R$ = $r_o\times 2^2$ = $0.53$ $\times$$4$ = $2.12A^{\circ }$