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Lecture 16

PHY 102 Lecture 16: Lecture 16-18 - Models of atoms and emission spectra

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Syracuse University
PHY 102

Lecture #16 Models of atoms and emission spectra Photons = bundles of energy - Suggests that light is particle-like - Its intensity depends on the frequency o E = hf - Light emitted by an excited gas are discrete  frequencies take on separated, precise values o Values of frequency between discrete values are forbidden Young’s 2-Slit Experiment - Suggest that light is a wave - Based on intensity as a function of amplitude of wave CONCLUSION: Light Duality: Light is BOTH a wave and particle - Louis de Broglie (1923) Rutherford Model of Atom - Experiment: Radioactive source emits alpha particles at thin gold foil - Results: Tiny, dense positive nucleus with concentrated mass - Lighter, negative electrons orbit like planets orbit around Sun Bohr Model of Hydrogen Atom - First brought information about atom energy levels and how electrons could emit different frequencies of light - Small, positive central nucleus - Negatively charged electrons circle the nucleus o Electrons can jump orbitals Lecture #17 Does matter wave? Ionization energy = binding energy - Energy needed to free an electron from its ground state - Expressed in value of eV (electron-volts) Bohr Model of Hydrogen Atom - First brought informatio
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