lecture6

lecture6 - E-M radiation! ! Black-body (Planck) radiation -...

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Black-body (Planck) radiation -- continuous at all ! emission depends only on T 1) hotter surface emits more at all ! 2) peak at shorter ! as T rises quantum radiation -- corresponding to quantized energy levels e - p + Hydrogen Quantum transitions : => only discrete orbits/energies if atom transitions between 2 states (1,2) ==> must emit/absorb energy = " E 1-2 possible transitions : collisional excitation/deexcitation radiative absorption spontaneous emission stimulated emission # E = E Fnal - E initial = h $ (radiation) , 1/2 mv 2 (collisional) absorption of photon excited state of atom atomic decay w/ photon emission w/i ~10 -6 sec h $ = % upper - E lower 3 radiative processes : photon absorption spontaneous decay w/ emission of photon stimulated emission 2 collisional processes : collisional excitation collisional de-excitation # E = E Fnal - E initial = h $ (radiation) , 1/2 mv 2 (collisional)
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lecture6 - E-M radiation! ! Black-body (Planck) radiation -...

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