Exam-style question
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What evidence from cathode ray experiments supports the existence of electrons?.
- A.Cathode rays are deflected by electric fields.
- B.Cathode rays produce heat when they strike a surface.
- C.Cathode rays can be seen with the naked eye.
- D.Cathode rays travel in straight lines in a vacuum.
Model answer
What a good answer should say
- Cathode rays are deflected by electric fields.
Explanation
Why this works
The evidence shows that cathode rays are deflected by electric fields, indicating that they carry a charge. This implies that the particles in cathode rays must be charged, leading to the conclusion that these particles are electrons, which were discovered through such experiments.
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