GG101 Lecture Notes - Lecture 5: Shortwave Radiation, Solar Wind, Kinetic Energy
Document Summary
Energy; a measure of the ability or capacity of a system to do work. Energy cannot be created or destroyed, but the form of energy can change. Energy can be transferred from one location to another. Clouds of (cid:272)harged (cid:894)io(cid:374)ized(cid:895) gases e(cid:373)itted fro(cid:373) the su(cid:374)"s surfa(cid:272)e. Responsible for auroras, communication disruption, possible weather links. Energy that propagates through space or a material medium, in the form of an advancing disturbance in the electric and magnetic fields. Objects (matter) with a temperature above absolute zero emits radiation (k= -273. 15 degrees celsius) The high an objects temperature, the greater the amount of radiation emitted per unit of surfa(cid:272)e area (cid:894)stefa(cid:374) b"s la(cid:449)(cid:895) The higher an objects temperature, the shorter the wavelength of maximum radiant e(cid:373)issio(cid:374) (cid:894)wie(cid:374)"s displa(cid:272)e(cid:373)e(cid:374)t la(cid:449)(cid:895) Objects that are good emitters of radiation (at given wavelengths) are also good absorbers (of those wavelengths) A blackbody is a perfect absorber and emitter. The su(cid:374)"s surfa(cid:272)e te(cid:373)perature is a(cid:271)out 6000k.
