Kinetic Theory
Uttar Pradesh Board · Class 11 · Physics
Quick revision notes for Kinetic Theory — Uttar Pradesh Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Molecular Nature of Matter
- All matter is made up of atoms - tiny particles in perpetual motion
- Atomic hypothesis: atoms attract when slightly apart, repel when squeezed together
- Ancient Indian philosopher Kanada (6th century BC) proposed atomic theory with four types of atoms: Bhoomi (Earth), Ap (water), Tejas (fire), and Vayu (air)
Behavior of Gases and Gas Laws
- Gases are easier to understand than solids/liquids due to negligible intermolecular forces
- Ideal gas approximation works best at low pressures and high temperatures
- Real gases deviate from ideal behavior at high pressures and low temperatures
Kinetic Theory of Ideal Gas
- Gas molecules are in constant random motion
- All collisions are perfectly elastic (kinetic energy conserved)
- Intermolecular forces are negligible except during collisions
Law of Equipartition of Energy
- Energy is equally distributed among all degrees of freedom
- Each degree of freedom contributes ½kBT to average energy
- Translational degrees of freedom: 3 (x, y, z directions)
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Kinetic Theory covers several key topics that are frequently asked in Uttar Pradesh Board Class 11 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
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