ASTR 103 Lecture Notes - Lecture 4: Chemical Substance, Big Bang, Dominant Wavelength
29 Jul 2018
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"man made" neutrinos: accelerators, nuclear power plant, astrophysical neutrinos, solar neutrinos, atmospheric neutrinos, relic neutrinos. Determining the speed of light: galileo tried unsuccessfully to determine the speed of light using an assistant with a lantern on a distant hilltop. Light travels through empty space at a speed of 300,000 km/s. Light is electromagnetic radiation and it characterized by its wavelength. Isaac newton discovered that the sun gives off white light, which is just all the colors of the rainbow. Infrared radiation: radio wave (longest waves, microwaves, visible light (roy g biv, ultraviolet radiation, x rays, gamma rays (shortest waves) Three temperature scales: kelvin, 0 is the coldest, 270 is the freezing point of water, 373 is the boiling point of water, sun"s surface temperature - 5,800. An opaque object emits electromagnetic radiation according to its temperature: hot: glows red, hotter: glows reddish-orange, even hotter: glows yellowish-white.
