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Modern Physics & Electronics JEE

Embodying as much as 19% of the whole of Physics, it is safe to say that from the weightage point of view, this is the most important unit. It is only because of the chapter of Atomic Physics which alone has seen 33 questions in the previous 10 years making it the most important chapter of all time. It is followed by a very important EM Waves & Communication which has seen 19 questions. While semiconductor is the least weightage based among these 3, it is equally important with 13 questions. Make it a point to not ignore any concepts from this chapter. If at all being prepared at the end, semiconductors can be selectively prepared. Ignoring any other chapter can prove to be a serious mistake.

Modern Physics & Electronics JEE Chapter Wise Overview

Number of questions asked in each chapter of Modern Physics & Electronics JEE from 2010 to 2020 in JEE


JEE Physics Chapter-wise weightage of Modern Physics & Electronics 2020

Let's find out the chapter-wise weightage of the unit Modern Physics

Chapters Weightage


List of important topics for Modern Physics & Electronics JEE

  • Mass-Energy relationship
  • Nuclear Binding Energy
  • Radioactivity
  • Photoelectric Effect
  • Photoelectric Effect
  • Logic gates (OR. AND. NOT. NAND and NOR)
  • Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet. X-rays. Gamma rays)
  • Applications of e.m. waves

Modern Physics & Electronics JEE Syllabus 2023,2024

  • Dual nature of radiation.
  • Photoelectric effect.
  • Hertz and Lenard's observations; Einstein's photoelectric equation: particle nature of light.
  • Matter waves-wave nature of particles, de Broglie relation.
  • Davisson-Germer experiment.
  • Alpha-particle scattering experiment; Rutherford's model of atom; Bohr model, energy levels, hydrogen spectrum.
  • Composition and size of nucleus, atomic masses, isotopes, isobars: isotones.
  • Radioactivity- alpha. beta and gamma particles/rays and their properties; radioactive decay law.
  • Mass-energy relation, mass defect; binding energy per nucleon and its variation with mass number, nuclear fission and fusion.
  • Semiconductors; semiconductor diode: 1-V characteristics in forward and reverse bias; diode as a rectifier; I-V characteristics of LED.
  • The photodiode, solar cell and Zener diode; Zener diode as a voltage regulator.
  • Junction transistor, transistor action, characteristics of a transistor: transistor as an amplifier (common emitter configuration) and oscillator.
  • Logic gates (OR. AND. NOT. NAND and NOR) Transistor as a switch.
  • Electromagnetic waves and their characteristics.
  • Transverse nature of electromagnetic waves Electromagnetic spectrum (radio waves, microwaves, infrared, visible, ultraviolet. X-rays. Gamma rays).
  • Applications of e.m. waves.
  • Propagation of electromagnetic waves in the atmosphere; Sky and space wave propagation. Need for modulation.
  • Amplitude and Frequency Modulation, Bandwidth of signals.
  • The bandwidth of Transmission medium, Basic Elements of a Communication System (Block Diagram only).

Modern Physics & Electronics JEE Video Lectures


Modern Physics & Electronics JEE Books

List of Chapters of Modern Physics & Electronics  
1-Atomic Physics Download
2-Nuclear Physics Download
3-Electronics Download
3-Alternating Current Download

Modern Physics & Electronics JEE Test Series 2022,2023,2024

List of FREE Modern Physics & Electronics JEE Tests  
Paper set 1 (Easy) Download Questions Download Solutions
Paper set 2 (Moderate) Download Questions Download Solutions
Paper set 3 (Difficult) Download Questions Download Solutions

Question on Modern Physics for JEE Main 2022, 2023, 2024

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The given logic symbol represents a gate called :



The half life of a certain radio isotope is 10 minutes. The number of radioactive nuclei at a given instant of time is 108. Then the number of radioactive nuclei left 5 minutes later would be


The half life of Pa – 218 is 3 minutes. What mass of a 16 g sample of Pa – 218 will remain after 15 minutes?


A. The wavelength of microwaves is greater than that of UV-rays.

B. The wavelength of IR rays is lesser than that of UV-rays.

C. The wavelength of microwaves is lesser than that of IR rays.

D. Gamma rays have shortest wavelength in the electromagnetic spectrum.

Of the above statements


What is order of energy of X-rays  and microwaves  

Q. Which chapters come under modern Physics?

The following Chapters are a part of Modern Physics 1. Dual Nature of Matter and Radiation 2. Atoms and NUCLEI 3. Electronic Devices 4. Electromagnetic Waves 5. Communication Systems

Q. Is Modern Physics hard for JEE?

If you speak to the scientist he will say there are a lot of questions unanswered in Modern Physics, but what is there in JEE is easy and high scoring. The best part is that in JEE main questions asked from Modern Physics are formulae based. But IIT has given modern physics some respect by asking difficult questions. Have a clear concept and you can do well in modern physics

Q. How many questions are asked from Modern Physics in JEE?

Every year about 19% of questions come from Modern physics making it very important. Modern physics is important from your 12th boards as well so you have to focus a lot on it. Just from Atomic physics, 30 questions have been asked in 10 years, EM Waves and communication 17 while semiconductors 13 questions.

Q. What are the important Topics in Modern Physics?

We will not advise you to study just topics because there is too much interlinking in the topics you should pay special attention to following topics 1. Photo-electric Effects 2. Bohr's Model of Atom 3. Atomic Spectra 4. Rydberg Equation 5. Quantum Mechanical Model

Q. How to study Modern Physics?

Modern physics required a lot of understanding and explanation HCV was once a good book to understand but with changing trends we will advise you to use video lectures by Kaysons to have a proper understanding since all topics have been explained with animation making it easy for you to virtualize and understand the topics with ease.

Q. Can I skip Modern Physics in JEE?

No, don't even think of it. You will not be able to do well in boards as well as JEE. Modern Physics is very important post 12th also even if you go for electronic engg. or electric if you do anything related to science Modern Physics will be important.

Q. Is NCERT enough for Modern Physics?

Not for getting a good Rank. Remember JEE asks 30% from NCERT concepts but from the remaining 70% you have to go in-depth of the topic for which NCERT is not enough, plus NCERT explanation for Modern Physics is very complicated and difficult to understand. We will advise you to use video to understand Modern Physics.