He built his cathode ray tube with a metal cylinder on the other end. Thompson, conducted his first cathode ray tube experiment to prove that rays emitted from an electron gun are inseparable from the latent charge. This force could be provided only result from a collision with a massive target or from an interaction with an electric or magnetic field of great strength.Ĭonclusion - It was discovered that every atom contains a nucleus (whose diameter is of the order 10-14m) where all of its positive charge and most of its mass are concentrated in a small region called an atomic nucleus. What is the Cathode Ray Tube Experiment In 1897, great physician J.J. To deflect the alpha particle backward, there must be a very large force. If an alpha particle collides with an atom, it would fly straight through, its path being deflected by at most a fraction of a degree. Because of their relatively much greater mass, alpha particles are not significantly deflected from their paths by the electrons in the metal’s atoms. Alpha particles, which are about 7300 times more massive than electrons, have a positive charge of +2e. Alpha particles are energetic nuclei of helium (usually about 6 MeV). First, he used a magnet and electrometer to observe that the cathode rays were indeed electrically charged. A narrow collimated beam of alpha particles was aimed at a gold foil of approximately 1 μm thickness (about 10,000 atoms thick). Thomson performed three experiments with cathode ray tubes.
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