answers with the correct number of significant figures. Use additional paper if needed. mumenTcal Express wavelength in nm 1. The threshold frequency for the photoelectric effect in lead (Pb) is 1.00 x1015 sec. a) Express this value in electron volt (ev) (L15-4)? b) Determine the kinetic energy of a single Pb electron if the metal is hit by an electromagnetic radiation of 1.00 x 1016 sec? c) If the mass of an electron is 9.109 x 1031 kg, how fast is it travelling (Ekin = ½mv)? %3D

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