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

Question

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

Canvas Classes · Accepted Answer

Key concept: Cathode rays are electrons

Cathode rays consist of electrons, regardless of the gas filled in the discharge tube. The gas in the tube only provides the medium for ionization — the cathode rays themselves are always electrons emitted from the cathode.

Properties of electrons are constant:
- Charge  =  C (fixed)
- Mass  =  kg (fixed)

Therefore, the  ratio of cathode rays is always the same regardless of the gas used — whether hydrogen, deuterium, helium, or any other gas.

Deuteriu

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