BRAINCAKEExam Question 3
Question
Ultraviolet light of wavelength 250 nm is shone onto the metal cathode of a photocell. The stopping potential is found to be 1.80 V.
(a) Explain what is meant by the stopping potential. (2)
(b) Calculate the maximum kinetic energy of the photoelectrons. (2)
(c) Calculate the work function of the metal, in J and in eV. (3)
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Key terms in this lesson
- work function
- The minimum energy needed for an electron to escape from the surface of a metal.
More in Quantum Physics
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All 21 lessons in Quantum Physics · All Edexcel AS-level Physics topics