Photoelectric problem

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The wavelength of visible light is between 400nm and 760nm. We shed a 100W visible light on a piece of metal.

In classical electrodynamics, what is the number of electrons escaping from the Lithium surface per second, if the metal absorbs 20% of the light? Lithium has a work function of 2.38eV.
 

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Gokul43201
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What minimum wavelength will lead to photoelectron emission (determine this from the work function) ? Now assume that the visible light has a flat frequency distribution and determine the number of sufficiently energetic photons incident on the metal (from the relevant fraction of total power). 20% of this number of photons may be assumed to each produce one photoelectron.
 

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