Quantum Theory

Max Planck
light was emitted from objects glowing at different temperatures; atoms can absorb and emit only certain amounts of energy
Albert Einstein
light of a specific frequency (energy) shines on a metal, the metal will eject electrons; a single photon of a specific quantity is needed
Bohr
electrons can have only specific allowed energy levels; electrons can undergo transitions between energy levels
de Broglie
electrons can be diffracted just as light can; wavelength inversely related to mass and velocity
Schrodinger
described the likely location of electrons in an atom
Heisenberg
Uncertainty Principle – can’t know both the position and motion of an electron at the same time
ROYGBIV
700 nm -> 400 nm
Units:
Energy
Mass
Length
J
kg
m
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