JEE Main 2026 — Physics Modern Physics

2026mcqmedium

In hydrogen atom spectrum, $(R \rightarrow$ Rydberg's constant $)$ A. the maximum wavelength of the radiation of Lyman series is $\frac{4}{3 R}$ B. the Balmer series lies in the visible region of the spectrum C. the minimum wavelength of the radiation of Paschen series is $\frac{9}{R}$ D. the minimum wavelength of Lyman series is $\frac{5}{4 R}$ Choose the correct answer from the options given below :

Official previous-year question

Held on 23 Jan 2026 · Verified 6 Jul 2026.

Options

A
B, D Only
B
A, B and C Only
C
A, B and D Only
D
A, B Only

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Solution

A. Maximum wavelength of Lyman series ( $n=1$ to $n=2$ ):

$\frac{1}{\lambda} = R\left(1 - \frac{1}{4}\right) = \frac{3R}{4}$

$\lambda = \frac{4}{3R}$ TRUE

B. The Balmer series lies in the visible region of the spectrum. TRUE

C. Minimum wavelength of Paschen series ( $n=3$ to $n=\infty$ ):

$\frac{1}{\lambda'} = R\left(\frac{1}{9}\right)$

$\lambda' = \frac{9}{R}$ TRUE

D. Minimum wavelength of Lyman series ( $n=1$ to $n=\infty$ ):

$\frac{1}{\lambda} = R\left(1\right)$

$\lambda = \frac{1}{R}$ , NOT $\frac{5}{4R}$ FALSE

So A, B and C are correct.

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Solution

A. Maximum wavelength of Lyman series ( $n=1$ to $n=2$ ):

$\frac{1}{\lambda} = R\left(1 - \frac{1}{4}\right) = \frac{3R}{4}$

$\lambda = \frac{4}{3R}$ TRUE

B. The Balmer series lies in the visible region of the spectrum. TRUE

C. Minimum wavelength of Paschen series ( $n=3$ to $n=\infty$ ):

$\frac{1}{\lambda'} = R\left(\frac{1}{9}\right)$

$\lambda' = \frac{9}{R}$ TRUE

D. Minimum wavelength of Lyman series ( $n=1$ to $n=\infty$ ):

$\frac{1}{\lambda} = R\left(1\right)$

$\lambda = \frac{1}{R}$ , NOT $\frac{5}{4R}$ FALSE

So A, B and C are correct.

JEE Main 2026 — Physics Modern Physics

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JEE Main 2026 — Physics Modern Physics

Options

Did you get this right?

Solution

Your note

JEE Main Modern Physics in other years

More JEE Main Modern Physics questions

Other Physics topics for JEE Main

Mechanics

Electromagnetism

Optics

Thermodynamics

Waves & Oscillations

Keep practicing Modern Physics