Question

The radius of the first orbit of hydrogen in $0.528\dot{A}$. The radius of second orbit of hydrogen is

• A. $4.752\dot{A}$
• B. $2.112\dot{A}$
• C. $0.071\dot{A}$
• D. $0.142\dot{A}$

Answer 1

The correct option is B $2.112\dot{A}$

$r_n\propto n^2$
$\frac{r_2}{r_1}=\frac{2^2}{1^2}=4$
$r_2=4r$
$=4\times 0.528$
$=2.112\dot{A}$