Question
Cathode rays constitute a stream of:
  1. Electrons
  2. Protons
  3. Positive ions
  4. Negative ions.

Answer

  1. Electrons
Explanation:

Cathode ray consists of fast moving charged particle. When electric and magnetic fields are applied to the cathode ray in the discharge tube, the rays are deflected thus establishing that they consist of charged particles. the direction of deflection show that cathode rays consist of negatively charged particle called electrons.

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