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JEE Main 202125 FebruaryEvening Shift

Exam: JEE Main
Year: 2021
Date: 25 February
Shift: Evening Shift
Subject: Physics
Chapter: Atomic Physics

JEE Main 2021 · 25 February · Evening Shift · Physics · Atomic Physics

The wavelength of the photon emitted by a hydrogen atom when an...

The wavelength of the photon emitted by a hydrogen atom when an electron makes a transition from

n = 2

to

n = 1

state is:

Options

A $121 . 8nm$
B $194 . 8nm$
C $490 . 7nm$
D $913 . 3nm$

Correct answer

A. $121 . 8nm$

Step-by-step solution

$\dfrac{1}{\lambda} = R\left(\dfrac{1}{{1}^{2}} - \dfrac{1}{{2}^{2}}\right)$

$\lambda = 121 . 8nm$

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