Long answer·Standard multi-step (3/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Describe how photoelectric current changes when the collector potential, light intensity, and frequency are varied one at a time in a photoelectric experiment.
Total: 6 marks
(a) Explain the current-potential variation for fixed frequency and intensity. (2 marks)
(b) Explain the effect of increasing intensity at fixed frequency above threshold. (2 marks)
(c) Explain the effect of increasing frequency at fixed intensity above threshold. (2 marks)
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