Why does the charge-to-mass ratio of positive rays

cbse
structureofatom

#1

Why does the charge-to-mass ratio of positive rays depend on the residual gas in the discharge tube? Why is the charge-to-mass ratio of all cathode rays the same?


#2

In case of positive rays, the ions remaining after the loss of electrons might have the same magnitude of charge, but different masses. Hence, they will have different charge to-mass ratio. Cathode rays are made up of electrons and all electrons have same charge to-mass ratio. That’s why charge to mass ratio of all cathode rays is same.