Exam-style question
Try this first
What is the relationship between the work function and the energy of emitted electrons in thermionic emission?.
- A.The work function must be greater than the energy of emitted electrons.
- B.The work function must be equal to the energy of emitted electrons.
- C.The work function must be less than the energy of emitted electrons.
- D.There is no relationship.
Model answer
What a good answer should say
- The work function must be less than the energy of emitted electrons.
Explanation
Why this works
For thermionic emission to occur, the energy of the emitted electrons must exceed the work function of the metal. This ensures that electrons have enough energy to escape the attractive forces of the metal.
Common mistake
No common mistake is linked to this question yet.