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Increasing the intensity of light increases the number of photons. However, to eject an electron, the frequency needs to increase to increase the kinetic energy and thus release/eject the electron. The energy per photon has to be greater or equal to the energy needed to remove an electron.
I think that increasing the intensity of light results in more photons being emitted. However, in the photoelectric experiment, the frequency is what determines whether an electron is ejected. This is because the frequency of the wave determines the energy of each individual photon.
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