Atomic Models and Quantum Numbers for handout shortened version new 4 slides per page

On a heuristic viewpoint concerning the production

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Unformatted text preview: LIGHT QUANTA or PHOTON) NP 1921.On a Heuristic Viewpoint Concerning the Production and Transformation of Light Atomic Absorption and Emission of Radiation • As early as 1888, Johannes Rydberg observed that a gas cloud consisting of atoms can absorb or emit light Full visible spectrum gas of atoms absorbs light Atomic Spectra – Absorption of light • Gaseous atoms can be shown to absorb light by using an absorption spectrum – Absorption spectra indicate the wavelengths of light that have been absorbed. gas of atoms emits light Atomic Absorption Spectroscopy Instrument 2 1/21/2014 Atomic Spectra and Rydberg Equation Atomic Spectra – Emission of light • The same gaseous atoms can be shown to emit radiation based on the emission spectrum it forms. Emission spectra of hydrogen 1880s - The Rydberg equation is an empirical equation that relates the wavelengths of the lines in the hydrogen spectrum. Flame test experiment Atomic Spectra and the Bohr Atom Atomic Spectra and the Bohr Atom 2. • EM as radiation with energy and has particle-like properties • Photoelectric effect shows particle nature of light • Atomic emission and absorption gives hint on the underlying structure of electrons in atoms Nobel Prize, Physics 1922 An electron moves in a circular orbit about the nucleus and it motion is governed by the ordinary laws of mechanics and electrostatics, with the restriction that the angu...
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