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...Electromagnetic radiation visible light ultraviolet infrared x rays etc oscillating perpendicular electric and magnetic fields travel through space at m s described in terms of frequency wavelength c units spectrum planck quantum theory observation heat a solid emits with distribution that depends on the temperature vibrating atoms hot wire caused emission whose color changed t classical physics could not explain this should be independent max assume energy can released or absorbed by packets only these have minimum size packet is proportional to e h constant js emitted whole multiples hc...