A calcium surface work function 287 ev is illuminated with, Ask an Expert

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A Calcium surface (work function = 2.87 eV) is illuminated with 200 nm light from a 2 mW laser.

How many photons per second are emitted by the laser?

Only a small fraction of these photons can interact with electrons at the surface. Suppose this fractional efficiency is 0.018%.

What is the current in the detector assuming all the emitted electrons are captured?

Note that current is charge(in Coulombs) per second. The charge of one electron is 1.6 x 10¹⁹C

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