Two lamps, each of power , emit monochromatic light. Lamp A has wavelength while Lamp…
PHYSICS · Single correct · A Level · Physics · Particles and radiation · Particles and radiation
Problem
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.