Question

Why does q/m ratio(specific charge) depend on nature of gas in anode ray experiment?

Answer 1

because the origin of canal rays are gaseous ions.

The gaseous atoms present in the glass discharge tube are hit by the cathode rays, which cause the electrons to gain energy and move out of the atom. As the electrons move out of the atom, the positively charged gaseous ions move towards cathode. These ions constitute the canal rays.

Therefore, canal rays depend upon the nature of gas in the discharge tube