Exam-style question
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In thermionic emission, what happens to the electrons when the temperature of the metal increases?.
- A.They are absorbed by the metal.
- B.They gain energy and may be emitted.
- C.They lose energy and become stationary.
- D.They change into protons.
Model answer
What a good answer should say
- They gain energy and may be emitted.
Explanation
Why this works
As the temperature of the metal increases, the thermal energy provided to the electrons increases, allowing them to gain enough energy to overcome the work function and be emitted from the surface of the metal.
Common mistake
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