A Level · A2 · multiple choice
A Level extension · Question 6
A Level extension · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
multiple choice1 mark
Light of wavelength 450 nm is incident on a metal surface of work function 2.0 eV. What is the maximum kinetic energy of the emitted photoelectrons?
- A
0.76 eV
- B
2.0 eV
- C
2.8 eV
- D
4.8 eV
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Answer overviewCorrect answer: A — 0.76 eV
01
1 markAnswer and reasoning
How to approach it
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is A: 0.76 eV
- 2
C is the photon energy itself, hc/λ = 2.76 eV, offered to candidates who stop before subtracting the work function. D adds the work function instead of subtracting it.
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