Look at the photograph of the lab set-up. Since the light source gets very hot,

Question

Look at the photograph of the lab set-up. Since the light source gets very hot, what affect do the heat photons have on photoemission?

they increase the number of photoelectrons, but by the same amount no matter how hot the light source
none, since the infrared photons are absorbed by the air before they reach the metal
none, since infrared photons are below the cut-off frequency
they increase the number of photoelectrons; the hotter the light source, the more effect they have
they decrease the number of photoelectrons by heating the metal and raising the work function

Explanation / Answer

none, since infrared photons are below the cut-off frequency

This is correct

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