Practicing Success

Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

Options:

a

b

c

d

Correct Answer:

a

Explanation:

$\text{Ionisation Energy } E = E_0 Z^2$

$\Rightarrow \frac{E_1}{E_2} = \frac{1^2}{3^2} = \frac{1}{9}$