Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

In Bohr's model, the atomic radius of the first orbit is $r_0$, then the radius of the third orbit is

Options:

$\frac{r_0}{9}$

$r_0$

$9 r_0$

$3 r_0$

Correct Answer:

$9 r_0$

Explanation:

$r_n \propto n^2$

$\Rightarrow \frac{r_3}{r_1} = \frac{3^2}{1^2} = 9$

$\Rightarrow r_3 = 9 r_0$