Question

Why is high voltage and low pressure maintained in the discharge tube?

Answer 1

1. Low pressure indicates that there are fewer gas molecules in the discharge tube.
2. When the number of molecules is very low, collisions between electrons move at a high velocity towards the anode, and gas molecules become effective.
3. These collisions cause electrons to be dislodged from gaseous molecules, resulting in the creation of cathode rays.
4. Furthermore, high voltage raises the kinetic energy of electrons, which enhances the likelihood of electron removal from gaseous molecules.