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A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy...

Physics
WAEC 2012
A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is
  • A. 1.0eV
  • B. 3.0eV
  • C. 4.0eV
  • D. 7.0eV
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Correct Answer: Option A
Explanation
K.E = hf - Wo

= 4 - 3 = 1eV
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