PHYS 1010Q Lecture Notes - Lecture 33: Photon, Electromagnetic Wave Equation, Electronvolt
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We have a strange and unsatisfying answer. We can predict the speed of light with a wave equation. We can predict how light changes speed when it goes through certain materials, like glass. How it interacts with atoms or any stuff . Light behaves like a wave traveling from a source to where it is detected. This behavior is evident from wave interference measurements and the prediction of the speed of light form the electromagnetic wave equation of maxwell. Light behaves like a particle when it is being emitted, absorbed, or scattered by an atom. The behavior is key to understand the planck radiation law, the photoelectric effect, and the spectra of atoms. In 1924, de broglie thought maybe electrons are particles and waves f. E f = h into v = f to get. = vh mv2 and get h mv = h. Example - what is the wavelength of an electron traveling at.