Find number abc
If c9cba - c9ca4 = 19 find number abc. Multiple solutions may exist.Correct answers: 12
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Henri-Alexandre DeslandresDied 15 Jan 1948 at age 94 (born 24 Jul 1853).French astrophysicist who invented a spectroheliograph (1894) to photograph the Sun in monochromatic light (about a year after George E. Hale in the U.S.) and made extensive studies of the solar chromosphere and solar activity. He worked at the Paris and Meudon Observatories. His investigation of molecular spectra produced empirical laws presaging those of quantum mechanics. He observed spectra of planets and stars and measured their radial velocities of, and he determined the rotation rates of Uranus, Jupiter and Saturn (shortly after James E. Keeler). |