Anode rays, discovery

Having demonstrated that X-rays are a secondary radiation cansed by what was referred to at the time as cathode rays , RSntgen showed that the study of the nature of X-rays had close ties with the determination of the natirre of electronic radiation. After the discovery by Crookes of the existence of a radiation emitted by the cathode and attracted by the anode, the question of the natirre of these cathode rays was the snbject of intense activity. When X-rays were discovered, the two theories clashed. Some considered that this cathode rays was cansed by a process of vibration taking place in the rarefied gas inside the tube (the ether ) [LEN 94, LEN 95], while others thought that this current was the result of the propagation of charged particles emitted by the cathode [PER 95, THO 97a]. 

Oa drops atively charged particles. His paper is generally accepted as the discovery of what became known as the electron. Thomson constructed a cathode-ray tube having a f hole in the anode through which a beam of electrons passed. 

Discovery of electrons Experiments around the turn of the twentieth century provided evidence that the atom consists of smaller particles. When J. J. Thomson applied a high voltage to two electrodes sealed inside an evacuated tube, an invisible beam, or ray, was found to emanate from the negative electrode (cathode) of the tube and travel toward the positive electrode (anode). The path of the beam could be made visible by the glow it caused when it passed across a plate coated with fluorescent material. The ray, called a cathode ray, could be deflected by electric and magnetic fields. 

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