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JAMB Physics 2005 Question 5

Question 5

Conduction through Liquids and Gases

The ray which causes gas molecules to glow is known as

  1. A.molecular ray.
  2. B.gamma ray.
  3. C.anode ray.
  4. D.cathode ray.
Show the answer and explanation

Answer: D (cathode ray.)

Explanation

Cathode rays (fast electrons) strike gas molecules in a discharge tube and make them glow.