Oscillations and Waves
Simple harmonic motion, mechanical waves, sound wave propagation, Doppler effect, and physical/geometrical optics.
Oscillations and Waves — Lessons (13)
Simple Harmonic Motion (SHM)
Kinematic equation a = -ω²x, displacement, velocity, acceleration phase relationships, simple pendulum, helical springs, and conservation of mechanical energy.
Wave Motion, Superposition & Stationary Waves
Progressive mechanical waves, wave speed formula v = fλ, phase differences, principle of superposition, standing waves formation with nodes and antinodes, and acoustic beats.
Sound Waves, Intensity & Doppler Effect
Speed of sound in gases, temperature dependence v ∝ √T, sound intensity and decibels, human ear response, and the Doppler frequency shift for moving sources and observers.
Stationary Waves: Strings and Organ Pipes
Transverse standing waves on stretched strings, Mersenne’s laws of sonometer, longitudinal standing waves in closed and open air columns, harmonics, and end corrections.
Geometrical Optics: Refraction, TIR & Prisms
Snell’s law of refraction, total internal reflection, critical angle, optical fibers, real and apparent depth, refraction through prisms, and the angle of minimum deviation.
Thin Lenses and Optical Instruments
Thin lens formula 1/v - 1/u = 1/f with Cartesian sign convention, displacement method f = (D² - d²)/(4D), combinations of lenses, compound microscope, and astronomical telescope.
Physical Optics: Interference, Diffraction & Polarization
Huygens’ wave theory, wavefronts, Young’s double-slit experiment, fringe width β = λD/d, diffraction grating d sin θ = nλ, Brewster’s law, and wave polarization.
Laboratory Practicals Hub: Oscillations & Waves
Interactive virtual laboratory investigations covering all 5 official NIE A/L Physics syllabus practicals: Sonometer laws, Resonance Tube speed of sound, Spectrometer Prism refraction, Transmission Diffraction Grating wavelength, and Convex Lens displacement method.
Electromagnetic Waves and Spectrum
Nature of electromagnetic waves, transverse electric and magnetic fields, speed in vacuum c = 1/√(μ₀ε₀) = 3 × 10⁸ m/s, electromagnetic spectrum classification, and practical applications.
Refraction of Light, Lenses and Prisms
Snell’s law of refraction n₁ sin θ₁ = n₂ sin θ₂, critical angle and total internal reflection, real and apparent depth, minimum deviation in triangular prisms, thin lenses, and lens formula 1/v - 1/u = 1/f.
The Human Eye and Vision Defects
Optical mechanism of the human eye, accommodation power, near point D = 25 cm, far point infinity, common vision defects (Myopia, Hypermetropia, Presbyopia, Astigmatism) and their corrective lenses.
Optical Instruments: Microscopes and Telescopes
Angular magnification M = θ/θ₀, simple microscope (magnifying glass), compound microscope in normal and near-point adjustment, astronomical telescope, tube length, and resolving power considerations.
Unit 3 Comprehensive Assessment: Oscillations & Waves
Official summative evaluation assessing student mastery across all 11 syllabus competencies (3.1 to 3.11) and practical procedures with automated grading, competency breakdown, and targeted revision.