AST101H5 Chapter Notes - Chapter 5: Light Pollution, Blueshift, The Sharper Image
Document Summary
Because electrons weigh next to nothing: number of neutrons doesn"t always = number of protons, carbon with 6 neutrons, 7 neutrons, 8 neutrons. Emission matter with energy emits energy as radiation. Absorption matter takes in radiation, gaining its energy. Transmission radiation passes through matter, with little absorption. (light goes through your glasses, goes through air, etc. ) Reflection or scattering radiation bounces off matter and goes in another direction: scattering happens all the time. A blue shirt absorbs all light except blue and it scatters the blue light across the room. Recall that information is in the spectrum = light arranged by wavelength. Many people studied the spectrum of light: kirchhoff"s laws of light, 1st law: a hot solid, liquid or dense gas emits radiation that varies smoothly with wavelength. No gaps where wavelengths have no light. Examples: filament of an incandescent light bulb, heating element of a stove.
