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In the explanation of photoelectric effe...

In the explanation of photoelectric effect, we assume one photon of frequency v collidies with an electron and transfers its energy. This leads to the equation for the maximum energy `E_max` of the emitted electron as
`E_max=hv-phi_0`
Where `phi_0` is the work function of the metal. if an electron absorbs 2 photons (each of frequency v) what will be the maximum energy for the emitted electron?

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