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JAMB Physics 1993 Question 46

Question 46

Conduction through Liquids and Gases

Which of the following statements correctly describe(s) cathode rays? I. They consist of tiny particles carrying negative electric charges II. They are deflected in a magnetic field but not in an electric field. III. They consist of fast moving neutrons and deflected in an electric field.

  1. A.I only
  2. B.III only
  3. C.I and II only
  4. D.II and III only.
Show the answer and explanation

Answer: A (I only)

Explanation

Cathode rays are streams of fast electrons (negative particles); they are deflected by both electric and magnetic fields, and they are not neutrons.