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Consider a 20 W bulb emitting light of w...

Consider a 20 W bulb emitting light of wavelength `5000 oversetcircA` and shining on a metal surface kept at a distance 2m . Assume that the metal surface work function of 2eV and that each atom on the metal surface can be treated as a cirular disc of radius 1.5 A.
How much time would be required by the atomic disc to receive enrgy equal to work function.

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