EM Waves

🟢 Lite — Quick Review (1h–1d)

Rapid summary for last-minute revision before your exam.

Waves — Key Facts Wave equation: v = fλ; v = √(T/μ) for string (T=tension, μ=linear density) Transverse: displacement perpendicular to propagation (string, light); Longitudinal: displacement parallel (sound, spring) Doppler Effect: f’ = f × (v ± v₀)/(v ∓ v_s); source moving toward observer → higher pitch Stationary waves: nodes (zero amplitude) and antinodes (maximum amplitude); fixed end → node ⚡ Exam tip: Doppler applies to ALL waves (sound, light, water); formula differs slightly for light

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🟡 Standard — Regular Study (2d–2mo)

Standard content for students with a few days to months.

Waves — NEET/JEE Study Guide Wave types: mechanical (require medium) vs electromagnetic (no medium; c=3×10⁸ m/s) Doppler: moving source: denominator; moving observer: numerator; both: combine effects Beats: f_beat = |f₁ - f₂|; heard when two close frequencies interfere; used in tuning Standing waves on string fixed at both ends: L = n(λ/2), f_n = n(v/2L); fundamental n=1 Open pipe: L = n(λ/2); closed pipe: L = n(λ/4) for odd n only; overtones differ

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🔴 Extended — Deep Study (3mo+)

Comprehensive coverage for students on a longer study timeline.

Waves — Comprehensive Notes Wave intensity: I = P/A = (1/2)ρAvω²A² (for sound); I ∝ A² and I ∝ f² Energy in wave: KE and PE are in phase for transverse waves at the same point; energy flows with the wave Doppler for light: f’ = f√((1+β)/(1-β)) for source approaching at speed v = βc Shock waves: when source speed > wave speed (sonic boom); Mach number M = v_sound/v_source Wave propagation in different media: v = √(B/ρ) for longitudinal sound in fluid; v = √(T/μ) for string

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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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