The correct option is D The charge by mass ratio of canal rays produced from H and He gases will be different.
A) Smaller the charge, greater the charge/mass ratio.
B) Cathode rays are made up of electrons and hence their nature is independent of the gas used.
C) Canal rays are made up of positive charge species and is different for different gases. H+ andHe+ will different charge by mass ratio.
D) Canal rays are made up of positive charge species and is different for different gases. H+ and He+ will have different charge by mass ratio.