Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

Two electrons are in n = 1 and n = 3 orbits respectively. Find the ratio of their energies.

Options:

9:1

1:9

1:3

3:1

Correct Answer:

9:1

Explanation:

Total energy : E = \(\frac{-13.6}{n^2}\) eV

$ \Rightarrow E \propto \frac{1}{n^2}$

$\Rightarrow \frac{E_1}{E_3}= \frac{3^2}{1^2} = 9:1$