Exam-style question
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What evidence supports the idea that cathode rays contain charged particles?.
Model answer
What a good answer should say
- The deflection of cathode rays in electric and magnetic fields indicates that they are charged particles.
- When a cathode ray is directed through these fields, it experiences a force that alters its path, demonstrating that it carries an electric charge.
Explanation
Why this works
This answer is strong because it directly addresses the evidence of deflection in fields, which is a key observation in understanding cathode rays. It tests the student's ability to connect experimental results to theoretical concepts about charged particles.
Common mistake
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