Chapter 29 of 36
Important Topics
Modern Physics-II — Important Topics
JEE Advanced · Physics
Most important topics from Modern Physics-II for JEE Advanced Physics 2026 — high-weightage areas based on previous year analysis.
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Topics covered in Modern Physics-II for JEE Advanced Physics.
Topics in Modern Physics-II
1
Nuclear Stability and Radioactivity
- Only 260 out of 1500 known nuclides are stable; others undergo radioactive decay
- For light nuclei (A < 40), stability occurs when N ≈ Z (neutron number ≈ proton number)
- For heavy nuclei, stability requires N > Z due to electrostatic repulsion between protons
2
Radioactive Decay Law
- Radioactive decay follows exponential law with decay rate proportional to number of nuclei
- Decay constant λ characterizes the probability of decay per unit time
- Half-life is time required for half the nuclei to decay
3
Successive Disintegration and Chain Reactions
- Parent nucleus A decays to daughter nucleus B, which may also be radioactive
- Rate of formation of B = rate of decay of A - rate of decay of B
- Daughter nuclei first increase, reach maximum, then decrease
4
Mass-Energy Equivalence
- Einstein's E = mc² shows equivalence between mass and energy
- Small mass changes in nuclear reactions produce large energy changes
- 1 atomic mass unit (u) = 931.5 MeV energy equivalent
Key Concepts
Only about 260 out of 1500The number of radioactive nuclei decreasesEinstein's equation E = mc² showsBinding energy (BE) is the energyHeavy nuclei (like ²³⁵U) split into
Frequently Asked Questions
What topics are covered in Modern Physics-II for JEE Advanced?
Modern Physics-II is an important chapter in JEE Advanced Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Nuclear Stability and Radioactivity, Radioactive Decay Law, Successive Disintegration and Chain Reactions, Mass-Energy Equivalence.
How important is Modern Physics-II for JEE Advanced?
Modern Physics-II is a frequently tested chapter in JEE Advanced Physics. Questions from this chapter appear regularly in previous year papers. There are 80 practice questions available for this chapter.
How to prepare Modern Physics-II for JEE Advanced?
Start by understanding the core concepts, then solve practice questions. Focus on formulas and their applications. Use revision notes for quick review before the exam.
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