Chapter 24 of 36
Revision Notes
Modern Physics-I — Revision Notes
JEE Mains · Physics
Free Modern Physics-I revision notes for JEE Mains Physics 2026 — key concepts, formulas, and definitions for quick revision.
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Key concepts, formulas, and definitions from Modern Physics-I for JEE Mains Physics preparation.
Key Topics to Revise
1
Dual Nature of Electromagnetic Waves
- Electromagnetic waves exhibit both wave and particle properties (wave-particle duality)
- Wave nature demonstrated by Young's double-slit experiment showing interference
- Particle nature demonstrated by photoelectric effect where light behaves as photons
2
Electromagnetic Spectrum
- Complete range of electromagnetic waves from γ-rays to radio waves
- Classified by wavelength/frequency and production method
- Visible light: 4000 Å to 7000 Å (violet to red)
3
Momentum and Radiation Pressure
- Electromagnetic waves carry linear momentum: p = E/c
- Radiation pressure on surface: p_rad = I/c (totally absorbed), p_rad = 2I/c (totally reflected)
- Force exerted by electromagnetic wave: F = (1/c)(ΔE/Δt)
4
de-Broglie Wavelength
- Matter exhibits wave-particle duality (de-Broglie hypothesis)
- de-Broglie wavelength: λ = h/p = h/(mv)
- For particle with kinetic energy K: λ = h/√(2mK)
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Key Concepts
Electromagnetic waves exhibit both wavedeBohr proposed quantized electron orbitsAtoms with one electron (HX
Frequently Asked Questions
What topics are covered in Modern Physics-I for JEE Mains?
Modern Physics-I is an important chapter in JEE Mains Physics. It covers key concepts and formulas that are frequently tested in the exam. Key topics include: Dual Nature of Electromagnetic Waves, Electromagnetic Spectrum, Momentum and Radiation Pressure, de-Broglie Wavelength.
How important is Modern Physics-I for JEE Mains?
Modern Physics-I is a frequently tested chapter in JEE Mains Physics. Questions from this chapter appear regularly in previous year papers. There are 115 practice questions available for this chapter.
How to prepare Modern Physics-I for JEE Mains?
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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