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The work function of a metal is 4.65ev and the metal is illuminated with a...

Physics
WAEC 1991
The work function of a metal is 4.65ev and the metal is illuminated with a radiation of 6.86ev. What is the kinetic energy of the electrons ejected from the surface of the metal?
  • A. 1.48ev
  • B. 2.21ev
  • C. 4.42ev
  • D. 5.75ev
  • E. 11.51ev
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Correct Answer: Option B
Explanation
K.E = \(\frac{1}{2}\)mv2

E - W = 6.86 - 4.65


= 2.21ev
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts