[" Figure represents a graph of kinetic energy of most "],[" energetic photoelectrons,"K_(max)(" in eV ")," and frequency "],[" (v) for a metal used as cathode in photoelectric "],[" experiment.The threshold frequency of light for the "],[" photoelectric emission from the metal is "],[qquad [" Kmax "2t],[qquad [" if "],[qquad " (b) "1.5times10^(14)Hz]]],[[" (a) "1times10^(14)Hz," (b) "1.5times10^(14)Hz,]]