Assertion: The photoelectrons produced by a monochromatic light beam incident on a metal surface, have a spread in their kinetic energies. Reason : The work function of the metal varies as a function of depth from the surface.

• A

  If both assertion and reason are true and reason is the correct explanation of the assertion
• B

  If both assertion and reason are true but reason is not the correct explanation of the assertion
• Correct answer
  C

  If assertion is true, but reason is false
• D

  Both assertion and reason are false statements.

Hence, the correct answer is option: 'C'.