Exam-style question
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What does the observation that cathode rays are attracted to a positively charged electrode demonstrate?.
- A.Cathode rays are neutral particles.
- B.Cathode rays are negatively charged particles.
- C.Cathode rays are positively charged particles.
- D.Cathode rays are magnetic monopoles.
Model answer
What a good answer should say
- Cathode rays are negatively charged particles.
Explanation
Why this works
evidence: Cathode rays are drawn toward a positively charged electrode and repelled by a negative one. interpretation: This behaviour matches that of negatively charged particles moving in an electric field.
implication: The attraction to positive charge confirms the negative charge of the particles. conclusion: The electrode attraction shows cathode rays are negatively charged particles.
Common mistake
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