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Which of the following statements correctly describe(s) cathode rays?

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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 filed.
  • III. They consist of fast-moving neutrons and deflected in an electric filed.

A. I only

B. III only

C. I and II only

D. II and III only.




Cathode rays are simply negatively charged particles called electrons, they travel in a straight line and are deflected by both electric and magnetic fields.

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Now for the right answer to the above question:

  1. Option A is correct. cathode rays are negatively charged tiny particles called electrons.
  2. Option B is incorrect. cathode rays are simply streams of electrons and not neutrons.
  3. C is incorrect. II is incorrect, they are deflected by both magnetic and electric fields.
  4. D is not the correct answer. II and III are both wrong.


You may please note these/this:

  • Cathode rays are simply electrons.
  • And these electrons are particles whose mass can be measured.

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/ culled from 2017 JAMB-UTME physics question 24 /

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