The e/m ratio for Anode rays

The e/m ratio for cathode rays:

The e/m ratio for cathode rays

The e/m ratio of cathode rays is x unit, when hydrogen is filled in the discharge tube. What will be its value when deuterium (D_(2)) is filled in it?

The e/m value for cathode rays

The e// m ratio for electron was determined by ……..

The e//m ratio for electron was determined by ……..