Physics · Atomic Physics

JEE Main 2025 — 4 April, Morning Shift — Question 46

Considering the Bohr model of hydrogen like atoms, the ratio of the radius of $5^{\text {th }}$ orbit of the

electron in $\mathrm{Li}^{2+}$ and $\mathrm{He}^{+}$ is

Option A:
$\frac{4}{9}$
Option B:
$\frac{2}{3}$
Option C:
$\frac{3}{2}$
Correct
Option D:
$\frac{9}{4}$

Answer: C

Step-by-step solution

$r \propto \frac{n^{2}}{z}$

$\frac{r_{\mathrm{L}^{+}}}{r_{\mathrm{He}^{+2}}}=\frac{2}{3}$

Answer key and solution verified before publishing.

Practise Atomic Physics

Start with this question, then two more from the same chapter — with a tutor that explains every step. Free.

Solve a similar one free

Exam: JEE Main 2025
Paper: 4 April, Morning Shift
Subject: Physics
Chapter: Atomic Physics
Topic: Rutherford's and Bohr's Model of Atom

Considering the Bohr model of hydrogen like atoms, the ratio of the… | JEE Main 2025 PYQ with Solution · DhiX AI