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If light with photon energy 2eV is incident suitably on the surface of a metal...

Physics
JAMB 1994
If light with photon energy 2eV is incident suitably on the surface of a metal with work function 3eV, then
  • A. no electron will be emitted
  • B. the few electrons emitted will have a maximum kinetic energy of 1eV
  • C. the few electrons emitted will have a maximum kinetic energy of 3eV
  • D. many electrons will be emitted
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Correct Answer: Option A
Explanation
An electron can only be emitted if photon energy is equal or greater than work function of the plate
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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts