. How are cathode rays formed from the gas taken in the discharge tube? Explain.
When the electricity at high voltage is passed through a gas at very low pressure taken in a discharge tube, streams of minute particles are given out by the cathode. These streams of particles are called cathode rays.
The reason behind the formation of cathode rays is that the gas taken in the discharge tube consists of atoms, and all the atoms contain electrons. When high electrical voltage is applied, the electrical energy pushes out some of the electrons from the atoms of the gas. These fast moving electrons form cathode rays.