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They were first observed in 1859 by German physicist Julius Plücker and Johann Wilhelm Hittorf, [1] and were named in 1876 by Eugen Goldstein Kathodenstrahlen, or cathode rays. [2] [3] In 1897, British physicist J. J. Thomson showed that cathode rays were composed of a previously unknown negatively charged particle, which was later named the ...
The cathode-ray tube by which J. J. Thomson demonstrated that cathode rays could be deflected by a magnetic field, and that their negative charge was not a separate phenomenon While supporters of the aetherial theory accepted the possibility that negatively charged particles are produced in Crookes tubes , [ citation needed ] they believed that ...
Studied discharge tubes with energy rays extending from a negative electrode, the cathode. These rays, which he discovered but were later called cathode rays by Eugen Goldstein, produced a fluorescence when they hit a tube's glass walls and, when interrupted by a solid object, cast a shadow. 1869: William Crookes: Invented the Crookes tube. 1873
Atoms were thought to be the smallest possible division of matter until 1899 when J. J. Thomson discovered the electron through his work on cathode rays. [ 37 ] : 86 [ 5 ] : 364 A Crookes tube is a sealed glass container in which two electrodes are separated by a vacuum.
1897 J. J. Thomson discovered the electron; 1897 Emil Wiechert, Walter Kaufmann and J.J. Thomson discover the electron; 1898 Marie and Pierre Curie discovered the existence of the radioactive elements radium and polonium in their research of pitchblende; 1898 William Ramsay and Morris Travers discover neon, and negatively charged beta particles
1932 Antielectron (or positron), the first antiparticle, discovered by Carl D. Anderson [13] (proposed by Paul Dirac in 1927 and by Ettore Majorana in 1928) : 1937 Muon (or mu lepton) discovered by Seth Neddermeyer, Carl D. Anderson, J.C. Street, and E.C. Stevenson, using cloud chamber measurements of cosmic rays [14] (it was mistaken for the pion until 1947 [15])
The most powerful telescope to be launched into space has made history by detecting a record number of new stars in a distant galaxy. NASA's James Webb Space Telescope, history's largest and most ...
The COBE mission also discovered small fluctuations in the CMB radiation, which were believed to be the seeds of galaxy formation. This discovery was a major breakthrough in our understanding of the early universe, as it provided evidence for the inflationary universe model. This model suggests that the universe underwent a rapid expansion in ...