Electromagnetic waves. EM spectrum, energy, momentum. Electric field and magnetic field. Doppler shift. Polarization.
Quantum Physics – Wave Particle Duality – in quantum everything behaves likes a Wave and a Point Particle simultaneously, even like electrons. Quasar Spectrum looks like Particles or little bullets. Whereas Visible Spectrum = Sun Light Source – acts like a wave and particles.
h/λ=mc Wave-particle momentum hc/λ=mc^2 energy
Human’s emit light energy of about 10 microns