RAMSEY COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY RAMSEY COLLECTION / AMERICAN INSTITUTE OF PHYSICS / SCIENCE PHOTO LIBRARY
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Bethe and Ramsey. Physicists Hans Bethe (left, 1906-2005) and Norman Ramsey (born 1915). Bethe worked on the atomic bomb project during World War II, and developed theories of energy production in stars. He was awarded the Nobel Prize for Physics in 1967 for his astrophysical work. Ramsey was awarded the same prize in 1989 for his development of the "separated field method" for studying atomic energy levels. This led to the development of the atomic clock (or caesium clock), which now provides the world's standard time.
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