Cathode rays are ______
A. High-energy electromagnetic waves
D. streams of electrons
Cathode rays are simply streams of negatively charged electrons.
Now for the right answer to the above question:
- 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.
- Option B is incorrect. cathode rays were found to be negatively charged, and not positively charged, so they cannot possibly be protons.
- C is incorrect. neutrons are neutral, but cathode rays are not neutral.
- D is the correct answer. They are simply streams of electrons.
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 /