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Sir W.H. Bragg

Sir W.H. Bragg

H402/0049

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Credit

SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY

Caption

Sir William Henry Bragg (1862-1942), the English physicist. In 1909 he took up duties as professor at Leeds and there began work on X-rays. In 1913 Bragg found that when X-rays are generated by the impact of high-energy electrons on a platinum target. X- rays, there is also some X-ray lines whose position is characteristic of the metal target. Moseley was shortly to use these X-ray spectra in a valuable way. Bragg, with his son Lawrence, went on to examine the wavelengths of X-rays by using crystals; their method founded X-ray crystallography. Bragg and his son won the 1915 Nobel prize for physics.

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