Physics · Atomic Physics

JEE Main 2025 — 22 January, Evening Shift — Question 53

An electron projected perpendicular to a uniform magnetic field B moves in a circle. If Bohr's quantization is applicable, then the radius of the electronic orbit in the first excited state is :

Option A:
$\sqrt{\frac{2 h}{\pi e B}}$
Correct
Option B:
$\sqrt{\frac{4 h}{\pi e B}}$
Option C:
$\sqrt{\frac{h}{2 \pi e B}}$
Option D:
$\sqrt{\frac{h}{\pi e B}}$

Answer: A

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Exam: JEE Main 2025
Paper: 22 January, Evening Shift
Subject: Physics
Chapter: Atomic Physics
Topic: Rutherford's and Bohr's Model of Atom

A light source of wavelength lambda illuminates a metal surface and electrons are ejected with maximum kinetic energy of 2 eV . If the same…

Answer: A

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