Short 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
Use the graph to answer the questions. The two curves are for the same metal and the same incident frequency.
Total: 3 marks
(a) What is the stopping potential shown by both curves? (1 mark)
(b) What is the ratio of the two saturation currents? (1 mark)
(c) What does this ratio tell you about the two incident intensities? (1 mark)
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