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A monochromatic light source of power 5mW emits 8X1015 photons per second. This light ejects photoelectrons from a metal surface. The stopping potential for this set up is 2V. Calculate the work function of the metal. (2)

Explanation:

P=×10-3W                             1n=PE,E=Pn=6.25×10-19j                  12E=3.9 eVW0=E-eV0                                 12     =(3.9-2)eV0W0=1.9eV                                     12

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