A laser delivers pulses of monochromatic light of wavelength 500nm, each pulse lasting 10ns and carrying an energy of 1.5μJ. The pulses fall normally on a photoemissive surface of area 0.20cm2 whose quantum efficiency is 15% for this wavelength. Assume that all emitted electrons are collected instantaneously.
a. (i) Calculate the average power of one laser pulse.
b. (ii) Find the number of photons present in a single pulse.
c. (iii) Determine the total charge liberated from the surface during one pulse.
d. (iv) Hence compute the average photocurrent during the pulse duration and state its value in mA."