![]() ![]() This led him to suggest the plum pudding model. These subatomic particles can be found within atoms of all elements.Ĭonclusion - The cathode rays are made up of negatively charged particles known as electrons. Nearly 100 years later, J J Thomson carried out experiments and discovered the electron. ![]() Rutherfords experiments led to the discovery of the. In Rutherfords experiments, most of the particles. Whose experiment bombarded gold foil with positively charged particles and noted that some particles were widely deflected. This module takes readers through experiments with cathode ray tubes. Experiments with cathode rays led to the discovery of the. Thomson also placed two magnets on either side of the tube, and observed that this magnetic field also deflected the cathode ray. The 19th and early 20th centuries saw great advances in our understanding of the atom. This indicated that the cathode ray was composed of negatively-charged particles. The cathode ray was deflected away from the negatively-charged electric plate and towards the positively-charged plate. Thomson's experiment on constituents of cathode rays:Įxperiment - To test the properties of the particles, Thomson placed two oppositely-charged electric plates around the cathode ray. An electric discharge is passed through the tube.Įmission of blue rays can be seen from the cathode.Ĭonclusion - The blue rays emitted from cathode are cathode rays. The existence of the electron showed that the 2,000-year-old conception of the atom as a homogeneous particle was wrong and that in fact the atom has a complex structure. Their work culminated in the discovery by English physicist J.J. William Crookes experiment for the discovery of cathode rays:Įxperiment - The figure shows a vacuum tube which has a gas at a very low pressure. Cathode rays are a type of radiation emitted by the negative terminal, the cathode, and was discovered by passing electricity through glass tubes from which the. During the 1880s and ’90s scientists searched cathode rays for the carrier of the electrical properties in matter.The discovery of cathode rays lead to the discovery of electrons : The three subatomic particles that constitute an atom are: ![]()
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