Nature of The Cathode Rays
Question: Whichever gas is used in the discharge tube, the nature of the cathode rays remains same. Why?
J.J Thomson concluded from his experiments that cathode rays consist of streams of negatively charged particles. He also determined the charge to mass ratio of electrons that is 1.7588 x 1011 coulombs kg -1. He performed many experiments by using different gases in discharge tube and found that the e/m value for cathode rays remained the same no matter which gas was used in the discharge tube Thomson concluded that all atoms contained electrons. This show that whichever gas is used in the discharged tube, the nature of the cathode rays remains the same.