What do we call the minimum energy that is required by an electron to leave the

C. work function

Explanation:

In the photoelectric effect, the energy of the incident photon is used in part to extract the electron from the metal (and this energy is called work function) and the rest is converted into kinetic energy of the electron. In formula:

where

hf is the energy of the incident photon, which is the product between h (the Planck constant) and f (the photon's frequency)

is the work function

K is the kinetic energy of the photoelectron as it leaves the material

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