Sound
Maharashtra Board · Class 11 · Physics
Quick revision notes for Sound — Maharashtra Board Class 11 Physics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Types of Waves and Their Properties
- Mechanical waves require a medium for propagation (water waves, sound waves, seismic waves)
- EM waves can propagate through vacuum (light, radio waves, X-rays)
- Matter waves are associated with moving particles (quantum mechanics)
Transverse and Longitudinal Waves
- Transverse waves: particles vibrate perpendicular to wave direction (water waves, EM waves)
- Longitudinal waves: particles vibrate parallel to wave direction (sound waves)
- Transverse waves have crests and troughs; longitudinal waves have compressions and rarefactions
Mathematical Expression of Waves
- Sinusoidal wave equation: y(x,t) = a sin(kx - ωt + φ)
- Wave traveling in +x direction: y = a sin(kx - ωt + φ)
- Wave traveling in -x direction: y = a sin(kx + ωt + φ)
Speed of Sound - Newton's and Laplace's Formulas
- Newton's formula: v = √(P/ρ) assuming isothermal process
- Laplace's correction: v = √(γP/ρ) considering adiabatic process
- γ = Cp/Cv = 1.41 for air (adiabatic ratio)
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Sound covers several key topics that are frequently asked in Maharashtra 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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