A cathode ray is a beam of electrons in a vacuum tube traveling from the nagatively charged electrode (cathode) at one end to the positively charged electrode (anode) at the other, across a voltage difference between the electrodes. They are called electron beams.

(1)cathode rays travel in straight line away from cathode with very high velocity ranging from 10 raised to the power 7 to 10 to the power 9 metre per second (2)Shadow of metallic objects in the path of cathode rays is cast on the wall opposite to cathode .(3)cathode rays produce a green glow when strike the glass wall matter, light is emitted when did strike the zinc sulphide screen (4) when a Small pin wheel is placed in the path of cathode rays the Blades of wheel are set in motion thus the cathode rays consist of material particles which have a mass and velocity. (5) when they applied to electric field deflected towards the positive charge thus they are negatively charged particles which were colled negatrons by Thomson . (6)the name was changed into electrons by stoney. (7)cathode rays produce energy when strike with matter. (8) nature of cathode rays independent of nature of cathode and gases present in discharge tube.