Charge to mass ratio of cathode rays depends on

Charge to mass ratio of cathode rays depends on
  1. Nature of the gas in the discharge tube
  2. Pressure of the gas in the discharge tube
  3. Material of cathode
  4. None of these

Solution

Charge to mass ratio of cathode rays is independent of the nature of the gas or material of the cathode.
The cathode rays have constant charge to mass ratio $(\mathrm{e} / \mathrm{m}$ ). This is because the nature of cathode rays does not depend upon the gas filled in the discharge tube, rather cathode rays are emitted by the cathode in the tube. *

Asked in: JEE-TOPICTESTS-CHEMISTRY

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