Exam-style question
Try this first
Which of the following best explains why the classical wave model cannot account for the immediate emission of electrons in the photoelectric effect?.
- A.The wave model predicts a delay proportional to the light’s intensity.
- B.The wave model predicts that electrons should be emitted at all frequencies.
- C.The wave model predicts that electrons should be emitted only after a build‑up of energy.
- D.The wave model predicts that electrons should be emitted only after a long exposure.
Model answer
What a good answer should say
- The wave model predicts that electrons should be emitted only after a build‑up of energy.
Explanation
Why this works
Classical wave theory would require energy to accumulate over time to free electrons, contradicting the observed instantaneous emission, thus failing to explain the phenomenon.
Common mistake
No common mistake is linked to this question yet.