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Use the information given below to answer question that follow.
The kinetic energy (K.E) of an electron, ejected from the surface of a metal illuminated by radiation of frequency, f is given by K.E =hf-Ø, where h is Planck’s constant and Ø is the work function of the surface.
If the frequency of the illuminating radiation is just equal to the threshold frequency of the surface, explain why no photoelectric effect is observed.