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A light of energy 5eV falls on a metal and the electrons with a maximum...

Physics
JAMB 1995
A light of energy 5eV falls on a metal and the electrons with a maximum kinetic energy of 2eV are ejected. The work function of the metal is
  • A. 0.4eV
  • B. 2.5eV
  • C. 3.0eV
  • D. 7.0eV
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Correct Answer: Option C
Explanation
Work function = 5 - 2

= 3eV
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