In the experiment of the photoelectric emission, if the surface is exposed to
a monochromatic light of frequency greater than the critical frequency of the metal,
then the experiment is repeated using a light of the same wavelength but its intensity
is double that of the first, then the quantity that is doubled is
- the energy of the photon
- the maximum kinetic energy of the emitted electrons
- the work function of the metal
- the intensity of the photoelectric current

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