Question

What is the difference between perforated cathode and normal cathode?Why can't we use normal cathode in Thomson's Atomic Model to find anode rays?

Answer 1

Perforated cathode means cathode with holes. In production of anode rays, a perforated cathode ray tube is used which is pierced with holes through which anode rays passed and form red spot behind the cathode because of strike between rays and wall of discharge tube. Through these holes, anode rays move towards cathode. If normal cathode is used then there will be no way for passing anode rays as in normal cathode there will be no holes in it.