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Dual Nature of Radiation & Matter JEE Main PYQs, 2020 to 2025

Dual Nature of Radiation & Matter has 127 questions in JEE Main papers from 2020 to 2025, about 21 per year across all shifts. The most asked topic is de Broglie Wavelength (59 questions), followed by Photoelectric Effect (59) and Work Function and Threshold Frequency (6).

Updated

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127Total PYQs
6Years covered
4Topics
2025 Apr S2Latest paper

Dual Nature of Radiation & Matter questions per year

YearQuestions
202518
202417
202323
202222
202132
202015

Topic-wise weightage

TopicQuestionsShare of chapterLast asked
de Broglie Wavelength5947%2025
Photoelectric Effect5946%2025
Work Function and Threshold Frequency65%2025
Davisson-Germer Experiment32%2023

Sample questions from recent papers

JEE Main 2025 · 8 Apr · Shift 2 · de Broglie Wavelength

An electron is released from rest near an infinite non-conducting sheet of uniform charge density '−σ-\sigma'. The rate of change of de-Broglie wave length associated with the electron varies inversely as nth power of time. The numerical value of n is _____.

Answer: 2

Step-by-step solution

JEE Main 2025 · 7 Apr · Shift 2 · Photoelectric Effect

A photoemissive substance is illuminated with a radiation of wavelength λi\lambda_i so that it releases electrons with de-Broglie wavelength λe\lambda_e. The longest wavelength of radiation that can emit photoelectron is λo\lambda_o. Expression for de-Broglie wavelength is given by:

(m: mass of the electron, h: Planck's constant and c: speed of light)

  1. (A)

    λe=hλi2mc\lambda_e = \frac{\sqrt{h \lambda_i}}{\sqrt{2mc}}

  2. (B)

    λe=h2mc(1λi−1λo)\lambda_e = \frac{h}{\sqrt{2mc \left( \frac{1}{\lambda_i} - \frac{1}{\lambda_o} \right)}}

  3. (C)λe=h2mc(1λi−1λo)\lambda_{\mathrm{e}}=\sqrt{\frac{\mathrm{h}}{2 \mathrm{mc}\left(\frac{1}{\lambda_i}-\frac{1}{\lambda_{\mathrm{o}}}\right)}}
  4. (D)λe=hλ02mc\lambda_e=\sqrt{\frac{h \lambda_0}{2 m c}}

Answer: (C)

Step-by-step solution

JEE Main 2025 · 3 Apr · Shift 1 · Work Function and Threshold Frequency

The work function of a metal is 3 eV . The color of the visible light that is required to cause emission of photoelectrons is
  1. (A) Red
  2. (B) Green
  3. (C) Blue
  4. (D)Yellow

Answer: (C)

Step-by-step solution

JEE Main 2023 · 31 Jan · Shift 1 · Davisson-Germer Experiment

Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R

Assertion A : The beam of electrons show wave nature and exhibit interference and diffraction.

Reason R : Davisson Germer Experimentally verified the wave nature of electrons.

In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A)A is not correct but R is correct.
  2. (B)Both A and R are correct and R is the correct explanation of A
  3. (C)Both A and R are correct but R is Not the correct explanation of A
  4. (D)A is correct but R is not correct

Answer: (B)

Step-by-step solution

All 127 questions are in the free PDF above, grouped by topic.

Frequently asked

How many questions come from Dual Nature of Radiation & Matter in JEE Main?

127 questions from 2020 to 2025, about 21 per year. In 2025 it had 18.

Which Dual Nature of Radiation & Matter topics are most important for JEE Main?

By past papers: de Broglie Wavelength (47%), Photoelectric Effect (46%) and Work Function and Threshold Frequency (5%) of all Dual Nature of Radiation & Matter questions.

Is the Dual Nature of Radiation & Matter PYQ PDF free?

Yes. The PDF, the answer key and every step-by-step solution on PrepWiser are free, with no login needed to practise.

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JEE Main PYQs by year: 2025 · 2024 · 2023 · 2022 · 2021 · 2020

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