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Cathode rays are…

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Cathode rays are ______

A. High-energy electromagnetic waves

B. protons

C. neutrons

D. streams of electrons




Cathode rays are simply streams of negatively charged electrons.

Now for the right answer to the above question:

  1. Option A is incorrect. cathode rays are not electromagnetic waves, this is because cathode rays are streams of particles with measurable mass. Now, electromagnetic waves are massless.
  2. Option B is incorrect. cathode rays were found to be negatively charged, and not positively charged, so they cannot possibly be protons.
  3. C is incorrect. neutrons are neutral, but cathode rays are not neutral.
  4. D is the correct answer. They are simply streams of electrons.
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You may please note these/this:

  • Cathode rays travel in a straight line
  • Are deflected away from negatively charged plate and towards positively charged plates, showing they are negatively charged.
  • Are also deflected in magnetic fields.

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/culled from 2018 JAMB-UTME physics question 8 /

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