Long answer·Standard multi-step (3/5)·Calculator allowed
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
Two metals P and Q have threshold wavelengths and respectively. Take .
Total: 6 marks
(a) Find the work function of each metal in eV. (2 marks)
(b) Which metal has the larger threshold frequency? Give the ratio. (2 marks)
(c) If light falls separately on both metals, decide which metal emits photoelectrons. (2 marks)
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