AST101_fall2011_lecture8_oct11_v1

AST101_fall2011_lecture8_oct11_v1 - Light Light Light in...

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Unformatted text preview: Light Light Light in the classroom Light Colour Colour Light in astronomy Light What is light? What Waves Descartes Explain Particles travels in straight line yes yes reflection yes yes different colours/prism yes yes Huygens built telescopes with lenses with lenses yes refraction yes Alhazen Newton built telescopes with mirrors with mirrors Waves? Descartes Descartes Huygens Young Maxwell Particles? Alhazen Alhazen Newton 1921 Nobel 1921 in physics in Einstein Hertz What is light? What Waves Descartes Explain Particles travels in straight line yes yes reflection yes yes different colours/prism yes yes refraction yes yes Huygens yes interference no no photo-electric effect Alhazen yes Newton BOTH Young Maxwell Einstein Hertz Electrons too! And protons, neutrons, De Broglie De everything else... 1929 Nobel in physics = Quasi Crystal (ordered but not periodic) 2011 Nobel prize in chemistry Shechtman Shechtman Wave properties wavelength x frequency = wavelength More than just light More r ed r ed nfra iinfra t et v oe viioll u tra ulltra Much more! Much wavelength energy How to “see” it? How The Milky Way Temperature and Heat Temperature Temperature average kinetic energy of randomly moving atoms Heat = Thermal energy total kinetic energy of randomly moving atoms Molecules Molecules made from Atoms Water molecule Carbon Monoxide molecule Hydrogen molecule Atomic structure Atomic Elements and Isotopes Elements Phases of Phases Matter Energy levels and Ionisation Energy Energy levels of Hydrogen Energy ...
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