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1 million electrons would be excited to a higher energy level. The photoelectric effect shows how photons can act as particles. Because each has a sufficient wavelength (as noted by the fact they are in the UV region), all should be excited.
1 million electrons is correct because each photon interacts with one electron, and a photon will only be absorbed if it has enough energy to excite an electron, so for every photon that is absorbed, one electron is excited.
Adding on, one photon interacts with one electron, and each photon must have enough energy to eject one electron to be absorbed. So if 1 million photons are absorbed, 1 million electrons are excited to a higher energy level.
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