Two lamps, each of power 20mW, emit monochromatic light. Lamp A has wavelength 500nm while Lamp B has wavelength 400nm. When either lamp illuminates the same photo-cathode (quantum efficiency = 100 %), which statement about the saturation photocurrent is correct?
a) Lamp B produces a larger saturation current than Lamp A.
b) Both lamps give the same saturation current.
c) Lamp A produces a larger saturation current than Lamp B.
d) Saturation current cannot be predicted without the work function.