The Photoelectric Effect and the de-Broglie wavelength of matter waves are important chapters in JEE Advanced Physics syllabus that fall under the category of Modern Physics. Quantum theory developed as a result of the Photoelectric Effect, which explains how light may evict electrons from a metal surface. Important considerations are the work function, threshold frequency, and emitted electron energy. The de-Broglie wavelength checks whether particles can have both wave-like and particle-like action. In this way, it is a fundamental connection between quantum mechanics and classical physics. Each of these two topics set the stage for understanding the wave-particle duality of matter and energy, which is often discussed in quantum mechanics.
The JEE Advanced Physics Paper has around 1-2 questions every year from the Photoelectric Effect, contributing roughly 4-6% of total marks. Likewise, de-Broglie wavelength contributes roughly a similar weightage, often using the wavelength of particles or relating to wave particle duality in some way. This question can include basic conceptual understanding of the de-Broglie wavelength to more advanced numerical problems and therefore is an important area to focus preparation on.
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JEE Advanced Previous Year Question Paper
Modern Physics - JEE Advanced
The syllabus consists of physical concepts that were revolutionized in the 20th century to give a new perspective on understanding the physical world. The more important topics that fall under the umbrella of "Modern Physics" include the Photoelectric Effect, Atomic Models, Nuclear Physics, Radioactivity, Dual Nature of Matter, and Binding Energy.
In JEE Advanced, you can expect around 2-3 questions from this section. It includes conceptual clarity and problem solving in Modern Physics. Nuclear Physics (calculation of Mass Defect and Binding Energy), Quantum Mechanics, and the Photoelectric Effect are important topics to focus on as questions frequently appear from those subjects.
Here are some of the most important JEE Advanced Previous Year Questions of Photoelectric Effect, de-Broglie wavelength of matter waves.
Question 1:
The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential in volt is:
Question 2:
When a monochromatic point source of light is at a distance of 0.2 m from a photoelectric cell, the cut-off voltage and the saturation current are respectively 0.6 V and 18.0 mA. If the same source is placed 0.6 m away from the photoelectric cell, then:
Question 3:
The threshold wavelength for photoelectric emission from a material is 5200 Å. Photoelectrons will be emitted when this material is illuminated with monochromatic radiation from a:
JEE Advanced Exam Pattern
The JEE Advanced exam is considered as one of the top engineering entrance examinations in India, which takes place annually for enrollment at IITs and other top institutions to undergraduate programs. JEE Advanced consists of two compulsory papers, Paper 1 and Paper 2, each with three hours of duration. It challenges students’ knowledge of Physics, Chemistry and Mathematics. The exam consists of different question types including Multiple Choice Questions (MCQs), Numerical Value-based Questions and Assertion-Reasoning questions to evaluate the foundational knowledge of topics and ability to solve problems. Both papers have a total of 180 marks, with marks deducted for incorrect answers in a few question types.
| Aspect | Details |
|---|---|
| Mode | Computer-Based Test (CBT) |
| Papers | 2 (Paper 1 & Paper 2) – Both mandatory |
| Duration | 3 hours per paper (with break between papers) |
| Total Subjects | Physics, Chemistry, Mathematics (Equal weightage) |
| Total Questions | ~54–60 (18–20 per subject, split across question types) |
| Language | English & Hindi (option to switch during exam) |
The exam is known for its challenging nature and is conducted in English and Hindi. It is essential to clear the JEE Main exam before appearing for JEE Advanced.
Question Type & Marking Scheme
Here is a detailed marking scheme for different questions in JEE Advanced exam.
| Question Type | Marks per Q | Negative Marking | Examples |
|---|---|---|---|
| Single Correct MCQ | +3 | -1 | Basic theory/direct formula questions |
| Multiple Correct MCQ | +4 (full) | -2 (if all wrong) / Partial marks* | "Which of the following is/are true?" |
| Numerical Value (NV) | +3 | No negative | Calculations (e.g., wavelength) |
| Paragraph-Based | Varies (2–4) | Depends on sub-type | Linked to a common scenario |
| Match the Following | +2 per match | -1 per wrong match | Column matching (e.g., graphs) |
Partial Marks: For Multiple Correct MCQs, +1 per correct option (if not all selected).
Subject-Wise Distribution (Per Paper)
Here is the subject wise questions distribution in the JEE Advanced exam.
| Subject | MCQs | Numerical | Paragraph/Matching | Total |
|---|---|---|---|---|
| Physics | 6–8 | 4–5 | 2–3 | 12–16 |
| Chemistry | 6–8 | 4–5 | 2–3 | 12–16 |
| Maths | 6–8 | 4–5 | 2–3 | 12–16 |
Subject wise Syllabus: JEE Advanced 2025
Here is a quick syllabus of JEE Advanced 2025 subject wise which helps in preparation of the students. Check JEE Advanced Syllabus for a detailed Syllabus.
| Subject | Key Topics |
|---|---|
| Physics | Mechanics, Electrodynamics, Modern Physics, Optics, Thermodynamics, Error Analysis |
| Chemistry | Physical (Thermo, Kinetics), Organic (Reactions), Inorganic (Coordination, P-Block) |
| Maths | Algebra, Calculus, Coordinate Geometry, Trigonometry, Vectors |
Note:
- Physics: Focus on Modern Physics (20% weightage) & Electrodynamics.
- Chemistry: Organic reactions & Coordination compounds are high-scoring.
- Maths: Calculus (35% weightage) is most critical.
In addition to conceptual knowledge, you should practice multiple mock tests before your exam.
Check:
JEE Advanced Physics Paper Analysis (2024 & Trends)
The JEE Advanced Physics Paper is designed to test a candidate in terms of knowledge in Physics as well as problem-solving skills and capabilities. The test consists of two papers, Paper 1 and Paper 2, with each paper being 3 hours in length and comprising an approximate number of 18-20 questions. The questions in both papers, while relating to a wide range of Physics Topics such as Mechanics, Electromagnetism, Optics, Thermodynamics, Modern Physics, Waves and Oscillations, etc., have the same syllabus in all subjects within the two papers.
Overview (2024)
Here is a basic overview of JEE Advanced Physics Pattern in 2024
| Aspect | Details |
|---|---|
| Total Questions | 18–20 per paper (2 papers) |
| Difficulty | Moderate to Hard (30% easy, 50% moderate, 20% difficult) |
| Question Types | Single/Multiple MCQs, Numerical Value, Paragraph-based, Match-the-Column |
| Key Focus Areas | Modern Physics, Electrodynamics, Mechanics, Error Analysis |
Chapter-Wise Weightage (2024)
The Physics subject in JEE Advanced incorporates a range of chapters from the Class 11 and Class 12 syllabus. The weightage from each chapter varies within each subject. Below is the subject-wise weightage of Physics subjects and possible weightage in JEE Advanced.
| Topic | Weightage | Difficulty | Remarks |
|---|---|---|---|
| Modern Physics | 20–25% | Moderate | Nuclear physics, photoelectric effect, semiconductors |
| Electrodynamics | 18–22% | Hard | EMI, Capacitors, AC circuits, Maxwell’s laws |
| Mechanics | 15–20% | Moderate-Hard | Rotational dynamics, center of mass, collisions |
| Thermodynamics & KTG | 12–15% | Moderate | Laws of thermodynamics, kinetic theory |
| Optics | 10–12% | Easy-Moderate | Wave optics, interference, diffraction |
| Error Analysis | 8–10% | Tricky | Vernier calipers, screw gauge, least count |
| Waves & SHM | 5–8% | Easy | Standing waves, Doppler effect, spring-mass systems |
- Main focus should be Modern Physics as it can be a game-changer topic.
- Focus on Electrodynamics and must have in-hand practice for the numerical questions as it is the hardest to score.
- Must have a good knowledge for conceptual topics.
Difficulty Trends (2019–2024)
Based on previous year trends, here is an overview of the JEE Advanced Question Paper based on its difficulty level and focus points of the exam.
| Year | Difficulty Level | Key Observations |
|---|---|---|
| 2024 | Moderate-Hard | More numerical-based questions, fewer theory MCQs |
| 2023 | Moderate | Balanced mix of conceptual and formula-based Qs |
| 2022 | Hard | Heavy focus on electromagnetism and modern physics |
| 2021 | Very Hard | Unconventional mechanics problems, lengthy solutions |
| 2020 | Moderate | More NCERT-aligned questions |
Key Points:
- Focus on numerical based questions more
- NCERT is the key to learn conceptual portion
- Modern Physics is the most important and scoring topic
JEE Advanced Previous Year Question Papers with Detailed Solutions
JEE Advanced 2024 Question Paper Pdf with Solutions
| Paper Name | Question Paper Link | Solutions Link |
|---|---|---|
| JEE Advanced 2024 Paper 1 Question Paper (English) | Download PDF | Check Solutions |
| JEE Advanced 2024 Paper 2 Question Paper (English) | Download PDF | Check Solutions |
| JEE Advanced 2024 Paper 1 Question Paper (Hindi) | Download PDF | Check Solutions |
| JEE Advanced 2024 Paper 1 Question Paper (Hindi) | Download PDF | Check Solutions |
JEE Advanced Question Paper has 4 sections- Section 1 (Maximum marks-12), Section 2 (Maximum marks-12), Section 3 (Maximum marks- 24) and Section 4 (Maximum marks-12)
JEE Advanced Architecture Aptitude Test Question Paper 2024 with Solutions
| Paper Name | Question Paper Link | Solutions Link |
|---|---|---|
| Architecture Aptitude Test | Download PDF | Check Solutions |
JEE Advanced 2023 Question Paper PDF Download With Solutions
| Paper | Question Paper PDF | Answer Key PDF |
|---|---|---|
| Question Paper 1 PDF | Download PDF | Check Solutions |
| Question Paper 2 PDF | Download PDF | Check Solutions |
| Question Paper AAT PDF | Download PDF | Check Solutions |
JEE Advanced 2022 Question Paper
| 2022 Question Paper | PDF Download |
|---|---|
| Question Paper 1 PDF | Click here |
| Question Paper 2 PDF | Click here |
JEE Advanced 2021 Question Paper
| Question Paper | PDF Download | ||
|---|---|---|---|
| Question Paper 1 PDF | Physics | Chemistry | Maths |
| Question Paper 2 PDF | Physics | Chemistry | Maths |
JEE Advanced 2020 Question Paper
| Question Paper | PDF Download |
| Question Paper 1 PDF | Click here |
| Question Paper 2 PDF | Click here |
Frequently Asked Questions (FAQs)
Q1. What is the weightage of photoelectric effect and de Broglie wavelength in JEE Advanced?
Answer. In JEE Advanced, the Photoelectric Effect and de-Broglie wavelength each represented about 4-6% of the total marks, generally comprising 1-2 questions. Combined, they are part of Modern Physics, which collectively represents 20-25% of the total marks.
Q2. Is the de Broglie wavelength of a matter wave important for JEE Advanced?
Answer. Absolutely, the de-Broglie wavelength of matter waves is relevant to the JEE Advanced exam. It is an essential topic in Quantum Mechanics and the JEE Advanced exam. Focus to consider and calculate the wavelength of particles (usually electrons), understand wave-particle duality, and apply the topic in different contexts (i.e., electron diffraction, momentum of particles) while solving the questions
Q3. What is the main domain of photoelectric effect and de Broglie wavelength?
Answer. The Photoelectric Effect and de-Broglie Wavelength are both primarily in the realm of modern physics. Both are subtopics within quantum mechanics.
- Photoelectric Effect: It is relevant to demonstrate the particle nature of light. Albert Einstein's explanation of the photoelectric effect in 1905 proved to be significant for quantum theory, showing that light behaves like a wave and also behaves like a particle (photons).
- de-Broglie Wavelength: Louis de Broglie proposed that all particles with momentum, such as electrons, have wave properties and the wave property can be expressed in the de-Broglie wavelength. This situation was important in the new theory of quantum mechanics, where certain physical behavior, like electron diffraction, could not be explained by classical physics.
Q4. Is de Broglie wavelength and photoelectric effect a tough chapter?
Answer. The de-Brogle wavelength and Photoelectric Effect are relatively difficult topics in JEE Advanced, but it can be easy once the basic ideas are understood. These topics require practice and consistency, and a good in-hand practice of numericals from JEE Advanced Previous Year Questions. You may get a good score in Modern Physics by following these tips and tricks.
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