She discovers that rays emitted by the uranium salt samples make the surrounding air electrically conductive, and measures the emitted rays' intensity. 1896-1897 Marie Curie (née Skłodowska, Becquerel's doctoral student) investigates uranium salt samples using a very sensitive electrometer device that was invented 15 years before by her husband and his brother Jacques Curie to measure electrical charge.1896-1897 – Pieter Zeeman first observes the Zeeman splitting effect by applying a magnetic field to light sources.In one experiment, Becquerel wraps a sample of a phosphorescent substance, potassium uranyl sulfate, in photographic plates surrounded by very thick black paper in preparation for an experiment with bright sunlight then, to his surprise, the photographic plates are already exposed before the experiment starts, showing a projected image of his sample. 1896 – Antoine Henri Becquerel accidentally discovers radioactivity while investigating the work of Wilhelm Conrad Röntgen he finds that uranium salts emit radiation that resembled Röntgen's X-rays in their penetrating power.1895 – Wilhelm Conrad Röntgen discovers X-rays in experiments with electron beams in plasma.1888 – Johannes Rydberg modifies the Balmer formula to include all spectral series of lines for the hydrogen atom, producing the Rydberg formula which is employed later by Niels Bohr and others to verify Bohr's first quantum model of the atom. 1888 – Hertz demonstrates experimentally that electromagnetic waves exist, as predicted by Maxwell.1887 – Heinrich Hertz discovers the photoelectric effect, shown by Einstein in 1905 to involve quanta of light.1885 – Johann Jakob Balmer discovers a numerical relationship between visible spectral lines of hydrogen, the Balmer series.
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