Q1. The output of a certain laser pointer consists of a beam with uniform irradiance across the beam's cross section. Assume a beam power of 1.00mW and beam diameter of 1.00mm. (a) Calculate the beam irradiance. (b) How many photons per second pass by any point in the beam if the wavelength is 633nm? (c) Repeat part (b) if the wavelength is 530nm.
Q2. Calculate the radiation pressure as the beams of problem above impinge on perfectly reflecting and perfectly absorbing surfaces. Calculate the photon momentum in each case.