Thomson’s experience consisted of studying beams of cathode rays passing through a system of parallel metal plates that created an electric field, and systems of coils that created a magnetic field. It was found that the beams were deflected under the action of both fields separately, and at a certain ratio between them, the beams did not change their straight trajectory. This field ratio depended on the particle velocity. Through a series of measurements, Thomson found that the speed of particles is much lower than the speed of light – thus, it was shown that particles must have mass. Further, an assumption was made about the presence of these particles in atoms and a model of the atom was proposed, which was later developed in the experiments of Rutherford.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.