Exam-style question
Try this first
What happens when the frequency of incident light is below the threshold frequency for a metal?.
- A.Electrons are emitted with high energy.
- B.No electrons are emitted.
- C.Electrons are emitted with low energy.
- D.Electrons are absorbed by the metal.
Model answer
What a good answer should say
- No electrons are emitted.
Explanation
Why this works
When the frequency of light is below the threshold frequency, the energy of the photons is insufficient to overcome the work function of the metal. This means that no electrons can be emitted, demonstrating the quantized nature of energy transfer in the photoelectric effect.
Common mistake
No common mistake is linked to this question yet.