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(i) State two factors that determine the speed of the photoelectrons emitted from a metal surface.(ii) The energy of a photon of light is 2.21
eV. (Electronic charge is 1.6 x#10^-19#C and planks constant h is 6.63 x #10^-34# Js).
(I) Express this energy in joules.
(II) Determine the frequency of the light that produces the photon.