This video lecture from Atomic Structure (F.Sc. First Year Chemistry) covers the discovery of electron/cathode rays, the experimental performance in which gas or air is given high voltage in discharge tube while keeping the pressure low and it produces the cathode rays. The properties of cathode rays are also discussed in the video. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.