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Unformatted text preview: Summary of equations for quantum mechanics and atomic structure, chemical bonding, and intermolecular interactions 14. Quantum mechanics and atomic structure The wave theory of light Speed of a wave of electromagnetic radiation: c = = 3 10 8 m s- 1 Wavelength (m): = c where is frequency in s- 1 Wavenumber (m- 1 ) : = 1 Plancks quantum theory Energy of 1 quantum of electromagnetic radiation E = h where h is Plancks constant. h = 6 . 626 10- 34 J s The photoelectic effect Energy of 1 photon E = h In a photoelectic effect, incident energy of photon=energy required to eject an electron + final kinetic energy of ejected electron h = + 1 2 mv 2 e The threshold frequency to dislodge one electron can be derived making = h threshold 1 Bohrs theory of the hydrogen emission spectrum Rydberg empirical formula to determine the wavenumber of the lines of the hydrogen- atom emission spectrum: = 1 = R H 1 n 2 f- 1 n 2 i !...
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