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Modern Physics

Periodic Law, quantum effect, recent technological advances, Roentgen, atomic number

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>  Relativity

>  Quantum Theory

>  Photoelectricity

>  X Rays

>  Atomic Models

>  Quantum Mechanics

>  Nuclear Physics

These very penetrating rays, first discovered by Roentgen, were shown to be electromagnetic radiation of very short wavelength in 1912 by the German physicist Max Theodor Felix von Laue and his coworkers. The precise mechanism of X-ray production was shown to be a quantum effect, and in 1914 the British physicist Henry Gwyn Jeffreys Moseley used his X-ray spectrograms to prove that the atomic number of an element, and hence the number of positive charges in an atom, is the same as its position in the periodic table (see Periodic Law). The photon theory of electromagnetic radiation was further strengthened and developed by the prediction and observation of the so-called Compton effect by the American physicist Arthur Holly Compton in 1923.

Electron Physics

The rapid expansion of physics in the last few decades was made possible by the fundamental developments during the first third of the century, coupled with recent technological advances, particularly in computer technology, electronics, nuclear-energy applications, and high-energy particle accelerators.

Article key phrases:

Periodic Law, quantum effect, recent technological advances, Roentgen, atomic number, German physicist, periodic table, short wavelength, computer technology, coworkers, prediction, observation, element, century, electronics, decades, position

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