New PDF release: A to Z of Physicists. Notable Scientists [biographies]

By Darryl J. Leiter

ISBN-10: 0816047987

ISBN-13: 9780816047987

One other very important survey within the amazing Scientists sequence, A to Z of Physicists focuses not just at the lives and personalities of these profiled, but in addition on their study and contributions to the sector. a desirable and significant component of this quantity is the eye paid to the stumbling blocks that ladies and minority physicists have triumph over to arrive their own objectives. via incidents, quotations, and images, the entries painting anything of the human face that is usually misplaced in books on technology and scientists. A to Z of Physicists positive factors a hundred and fifty entries and 50 black-and-white images. Culturally inclusive and spanning the complete diversity of physicists from precedent days to the current day, this is often an amazing source for college kids and common readers attracted to the heritage of physics or the numerous points of the private lives of vital physicists.

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Since an electron in the innermost orbit has no orbit with less energy to jump to, the atom remains stable. Bohr’s theory explained many of the spectral lines for hydrogen and helium, but he hesitated to publish his results, fearing that no one would take him seriously unless he explained the spectra of all the elements. It was Rutherford who persuaded him that the ability to explain hydrogen and helium would be quite enough to make his model credible. Indeed, when Bohr’s three papers on the structure of the hydrogen atom and on heavier atoms appeared in 1913, they had a profound, unsettling effect.

THOMSON, who had recently discovered that cathode rays consisted of electrons. Barkla’s first original experiment measured the velocity of electromagnetic waves traveling along wires of different thickness and composition. He transferred to King’s College, Cambridge, in 1900, to pursue another passion— choral singing—but also continued his physics research. It had been known since 1897 that when X rays fall on any substance, whether solid, liquid, or gas, they cause a secondary radiation to be emitted.

Of a specific wavelength associated with a particular substance) were monochromatic, that is, contained one frequency. Barkla discovered two types of characteristic X-ray emissions: the K series (for the more penetrating emissions) and the L series (for the less penetrating). A later prediction that other series of secondary emissions might exist was justified when an M series with even lower penetrating power than the K series was discovered. In 1909 Barkla became professor of physics at Kings College, London, and in 1913 he became professor of natural philosophy at Edinburgh University.

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A to Z of Physicists. Notable Scientists [biographies] by Darryl J. Leiter

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