Einsteins explanation for photoelectricity
einstein assumed that light is made up of wavepackets known as photons
each of energy that is equal to hf
plancks constant x frequency of the light
when light is incident on a metal an electronat the surface absorbs a single photon and therefore gains energy equal to hf
an electron can leave the metal surface if the energy gained by the photon exceeds the work function of the metal
work function is the min energy needed for the electron to escape from the metal surface
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