Slide Preview for EdExcel Unit 2 - Physics at Work

Powerpoint Description:

Waves: Transverse and longitudinal waves, oscillating systems, phase difference, the wave equation, the electromagnetic spectrum and its uses and dangers, reflection and refraction, refractive index, Snell's Law, measuring refractive index, critical angles, total internal reflection, polarisation, using polarised light, pulse-echo techniques, ultrasound, the Doppler Effect, coherence, superposition, constructive and destructive interference, path difference, Young's Double Slit experiment, interference patterns from 2 slits, interferometers, how CD players work, stationary waves, standing waves, harmonics and wind instruments, diffraction, image resolution, electron diffraction. Electricity: Basic principles of electric currents, calculating charge, how current and voltage behave in series and parallel circuits, Kirchoff's laws, voltage-position graphs, EMF, resistors in series and parallel, carrier density, drift speed, resistivity, potential dividers, current-voltage graphs, internal resistance. The Nature of Light: Intensity, photoelectric emission, E=hf, calculating the energy of a photoelectron, photon energy, spectra, emission and absorption spectra, energy levels.