![]() ![]() The Ancient Greek theory has been credited to several different scholars but is most often attributed to Democritus (460–370 BC) and his mentor Leucippus. The word ‘atom’ actually comes from Ancient Greek and roughly translates as ‘indivisible’. In fact, we have to go all the way back to Ancient Greece to find its genesis. Though our graphic starts in the 1800s, the idea of atoms was around long before. This graphic takes a look at the key models proposed for the atom, and how they changed over time. Despite this, our ideas about what an atom is are surprisingly recent: as little as one hundred years ago, scientists were still debating what exactly an atom looked like. This is something we now take as a given and one of the things you learn right back at the beginning of high school or secondary school chemistry classes. Initially, Becquerel also studied the Earth's magnetic fields. Later, in 1894, Henri Becquerel became chief engineer in the Department of Bridges and Roads before beginning his first experiments.īecquerel began to publish works related to the plane polarization of light, the phenomenon of phosphorescence and the absorption of light by crystals. Henri Becquerel's professional careerīecquerel held the chair of physics at the National Museum of Natural History in 1892. In this way, Becquerel deduced that this phenomenon was characteristic of the uranium atom, thus discovering natural radioactivity.Īfter several experiments, he concluded that natural radioactivity was the property of some substances, such as uranium, radium, and polonium to emit radiation without any external cause. After some time developing the tiles, he noticed that the stones had been printed very accurately. On one occasion, he packed a rock fragment containing uranium on black paper in a closet with some photographic plates. In that year, Henri Becquerel was conducting experiments with uranium salts. Henri Becquerel carried out various experiments that led him to discover by chance that a uranium compound veiled photographic plates wrapped in black paper. What was Becquerel's most important discovery?Īround the year 1896, Henri Becquerel discovered radioactivity naturally. His death was probably caused by handling radioactive materials. Henri Becquerel's death occurred on August 25, 1908, in Le Croisic, France. In 1892 he succeeded his father in the chair of the Museum of Natural History, and in 1895 he became a professor at the Polytechnic School. In 1890 he remarried Louise Désirée Lorieux. In 1875 he entered the department of bridges and highways, and became chief engineer in 1894. ![]() In 1874, Henri married Lucie Zoé Marie Jamin, who died giving birth to their son, Jean. Later he studied engineering at the École Polytechnique and the École des Ponts et Chaussées. Henri Becquerel's studies began at the Lycée Louis-le-Grand school in Paris. Becquerel shared the 1903 Nobel Prize in physics with the Curie couple (Pierre Curie and Marie Curie) for their research on fluorescence and the discovery of the phenomenon of radioactivity.Īntoine-Henri Becquerel was born in Paris into a wealthy family that produced four generations of physicists: the grandfather (Antoine César Becquerel), the father (Alexandre-Edmond Becquerel) and the son (Jean Becquerel). Antoine-Henri Becquerel was a French physicist (Paris, 1852 - Le Croisic, 1908). ![]()
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