Kinetic Theory

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Kinetic Theory — Key Facts Assumptions: gas consists of many point molecules, random motion, no forces between molecules except collisions, collisions are elastic rms speed: v_rms = √(3RT/M) = √(3P/ρ); at 300K, v_rms(N₂) ≈ 517 m/s Ideal gas: PV = nRT; kinetic interpretation: P = (1/3)ρv_rms² ⚡ Exam tip: Average KE of gas molecules depends ONLY on temperature: KE_avg = (3/2)kT

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Kinetic Theory — NEET/JEE Study Guide Degrees of freedom: monatomic (3), diatomic (5 at room temp, 7 at high T), non-linear triatomic (6) Equipartition: each degree of freedom contributes (1/2)kT to energy; total KE = (f/2)nRT Mean free path: λ = 1/(√2 π d² n*) where n* = number density; inversely proportional to pressure Brownian motion: evidence for kinetic theory; pollen grain random motion due to molecular collisions

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Kinetic Theory — Comprehensive Notes Maxwell speed distribution: fraction with speed between v and v+dv; most probable, mean, rms speeds differ Van der Waals gas: corrections to ideal — attractive forces (a) and finite molecular volume (b); a = 1.39 L² atm/mol², b = 0.039 L/mol for N₂ Transport phenomena: viscosity (η = (1/3)ρv_rms λ), thermal conductivity (K = (1/3)ρv_rms λ c_v), diffusion (D = (1/3)v_rms λ) Graham’s law of effusion: rate ∝ 1/√M; lighter gas effuses faster; used in uranium enrichment

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📊 NEET UG Exam Essentials

Detail	Value
Questions	200 (180 mandatory + 10 optional)
Time	3h 20min
Marks	720
Section	Physics (50), Chemistry (50), Biology (100)
Negative	−1 for wrong answer
Qualifying	50th percentile (general category)

🎯 High-Yield Topics for NEET UG

• Human Physiology — 18 marks
• Genetics & Evolution — 16 marks
• Ecology & Environment — 12 marks
• Organic Chemistry (Reactions) — 15 marks
• Electrodynamics (Physics) — 18 marks
• Chemical Equilibrium — 10 marks

📝 Previous Year Question Patterns

• Q: “A particle moves in a circle…” [2024 Physics — 2 marks]
• Q: “Identify the incorrect statement about DNA…” [2024 Biology — 4 marks]
• Q: “The major product ofFriedel-Crafts acylation is…” [2024 Chemistry — 3 marks]

💡 Pro Tips

• NCERT Biology is the single most important resource — 80%+ questions are from NCERT lines
• Focus on Human Physiology, Genetics, and Ecology — together they make ~40% of Biology
• In Physics, master Electrostatics + Current Electricity + Magnetism (combined ~20%)
• Organic Chemistry: learn named reactions with mechanisms — they repeat across years

🔗 Official Resources

• NTA Official
• NEET Syllabus PDF

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