Exam-style question
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What evidence from cathode ray experiments supports the existence of electrons?.
Model answer
What a good answer should say
- The deflection of cathode rays in electric and magnetic fields indicates that they are composed of charged particles.
- This shows that cathode rays are negatively charged, leading to the conclusion that they are electrons.
Explanation
Why this works
This answer is strong because it directly links the observed deflection of cathode rays to their charge, demonstrating an understanding of how this evidence supports the existence of electrons. The question tests the ability to connect experimental observations to theoretical conclusions.
Common mistake
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