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Which of following in not a property of cathode ray

  • A.These rays can ionise gases
  • B.These rays can penetrate through thin metal foils
  • C.These rays make materials cool on which they fall
  • D.Cathode rays are invisible and travel in a straight line

Answer: C

Cathode rays do not make materials cool - they heat them.

Being fast electrons, they give up kinetic energy on striking a target, which appears as heat and, from a heavy target, as X-rays. They do ionise gases, penetrate thin metal foil, and travel in straight lines while remaining invisible themselves.

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