The e/m ratio of cathode rays does not change by changing the gas in cathode ray discharge tube. But the e/m ratio of anode rays changes by changing the gas in the discharge tube. Justify this statement.

Explanation

(a) Nature of cathode and anode rays
(b) The composition of anode and cathode rays
(c) Factors influencing e/m ratio of anode and cathode rays
(d) Change in e/m with gas for cathode and anode rays