Prof. Marcia Grail is attempting to harvest electrons from a huge chunk of Calci

Question

Prof. Marcia Grail is attempting to harvest electrons from a huge chunk of Calcium (for use in charging her enormous capacitor no doubt), and has directed a source of blue visible light to illuminate the plate to liberate the electrons via the photoelectric effect. When illuminated, no electrons are liberated and no current flows. Frustrated, she takes a sample of the material and finds that instead of the requested chunk of Calcium that she instructed her robotic assistant Codex to set up, Codex has used platinum. Why does this cause there to be no current flow? What intensity of blue visible light would be needed in order to get current to flow?

Explanation / Answer

It happened because the energy of the blue visible light(photon) is not greater than the work function of the Platinum. It doesn't matter how intense it is. It will never get the current flow.

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