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It doesn't eject an electron because the metal needs to have a certain threshold of frequency for the electron to be ejected. By increasing the intensity, all that does is increase the amount of photons present in the light, but will have no effect in actually on ejecting the electrons.
An electron is not ejected because increasing the light's intensity only increases the number of photons. If your 10 photons don't have enough energy, adding 50 more of the same energy won't cause the electrons to eject. You must increase the energy of each of the photons allowing each to overcome the threshold and eject an electron.
Increasing the intensity of light would only increase the number of photons. If the photons don't have sufficient energy to overcome the binding between the electron and the metal then just increasing the number of photons won't cause an electron to eject since each photon has the same energy. You would have to increase the frequency in order for there to be an increase in the energy of the photon to overcome the threshold and eject an electron.
Increasing the intensity of light does not eject an electron because in order for that to happen there would need to be an increase in frequency, and increasing the intensity only increases the photons, therefore an electron would not be ejected.
Increasing the intensity of light does not result in an ejected electron because in this experiment, the light is acting as particles (photons). Increasing the light would only increase the amount of photons, not how much energy each photon has. So if one photon doesn't have enough energy to eject an electron, then no matter how many photons you shoot at the metal surface, none of them will be able to eject an electron.
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