(a) Calculate the momentum of a photon of light of wavelength 500 nm.
(b) Find the number of photons emitted per second by a 25 W sourse of monochromatic light of wave length 600 nm.
(c) How many photons per second does a one watt bulb emit if its efficiency is `10%` and the wavelength of light emitted is 500 nm?
(d) Monochromatic light of wavelength 300 nm is incident normally on a surface of area `4 cm^(2)` . If the intensity of light is `150 m W//m^(2)` , determine the rate at which photons strike the surface.