Target Exam

CUET

Subject

Physics

Chapter

Atoms

Question:

In terms of Bohr radius $a_o$ the radius of 2nd Bohr orbit of Hydrogen is :

Options:

$4 a_o$

$8 a_o$

$\sqrt{2} a_o$

$2 a_o$

Correct Answer:

$4 a_o$

Explanation:

The correct answer is Option (1) → $4 a_o$

The radius of the n-th Bohr orbit for the hydrogen atom is -

$r_n=a_0.n^2$

where,

$r_n$ = n-th Bohr obit radius

n = Principle quantum number

$r_1=a_0.(2)^2=4a_0$