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Unformatted text preview: problems: blackbody radiation, photoelectric effect, line spectra of atoms and molecules • Most scientists thought these would soon be solved and the universe understood. Revolution in Science Revolution
• 1900 - Planck explained blackbody radiation using quantized energy • 1905 - Einstein explained photoelectric effect using quantized energy • 1905 – Einstein published special theory of relativity • 1913 – Bohr theory of the atom • 1923 – deBroglie wave hypothesis • 1925 - Schrödinger wave mechanics • 1925 – Heisenberg matrix mechanics • 1927 – electron diffraction confirms deBroglie Quantization of Energy
Max Planck (1858-1947) An object can gain or lose energy by absorbing or emitting radiant energy in discrete amounts or QUANTA. Energy of radiation is proportional to frequency E = hν
h = Planck’s constant = 6.6260693 x 10-34 J s Quantization of Energy E = hν
Light with large λ (small ν ) has a small E Light with a short λ (large ν ) has a large E...
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