# 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.

Dear Student,
Work function is given as
$W=E-\mathrm{e}V=\frac{P}{n}-\mathrm{e}V$
Given:

The work function can be calculated as

Regards

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