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B) Wave and particle models of light: Electromagnetic wave domains. Relationship between wavelength, speed of light and frequency. The photon. Energy of a photon. Qualitative description of light-matter interaction: absorption and emission. Quantification of the energy levels of atoms. 00:00: Credits 00:05: What is light? 02:24: Light & Wavelength 03:48: What is a photon? 04:46: How to explain emission and absorption spectra? 07:44: Exercise: the Hydrogen atom 08:07: Correction of the exercise 09:53: See you soon, towards Physics and beyond...