BRAINCAKEExam Question 2
Question
The work function of a metal is 2.30 eV.
(a) State what is meant by the work function. (1)
(b) Calculate the threshold frequency for this metal. (3)
(c) Light of frequency 4.00 × 1014 Hz is shone on the metal. Explain why no electrons are emitted, even when the light is made very bright. (2)
(d) Light of frequency 7.50 × 1014 Hz is now used. Calculate the maximum kinetic energy of the emitted electrons. (2)
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Key terms in this lesson
- threshold frequency
- The minimum frequency of electromagnetic radiation that will cause photoelectric emission from a given metal surface.
More in Quantum Physics
- Electron Energy Levels
- Excitation and De-excitation
- Line Spectra
- Exam Question 1
- Exam Question 3
- Exam Question 4
- Exam Question 5
- Exam Question 6
All 21 lessons in Quantum Physics · All Edexcel AS-level Physics topics