Exam-style question
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What causes electrons to be released from metals during thermionic emission?.
- A.Heating the metal to a high temperature
- B.Applying a magnetic field
- C.Increasing the pressure on the metal
- D.Using a cathode ray tube
Model answer
What a good answer should say
- Heating the metal to a high temperature
Explanation
Why this works
Heating the metal increases the thermal energy of the electrons, providing them with enough energy to overcome the work function of the metal. This results in the release of electrons, which can then contribute to electric current in devices.
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