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In an experiment on photoelectric effect, the graph between maximum kinetic energy (KEmax) and frequency of emitted photoelectron from metal surface is found to be a straight line as shown below. Calculate (a) threshold frequency 𝑓_𝑡.(b) work function W (in eV) of metal in electron volt.(c) maximum kinetic energy of the emitted electron by light of frequency 12 x 1014 Hz.