Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

The radius of the first (lowest) orbit of the hydrogen atom is a0. The radius of the second (next higher) orbit will be :

Options:

4a0

6a0

8a0

10a0

Correct Answer:

4a0

Explanation:

$r_n \propto n^2$

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

$ r_1 = a_0 \Rightarrow r_2 = 4 a_0$