A 16.0-mW helium-neon laser emits a beam of circular cross section with a diameter of 2.85 mm.
(a) Find the maximum electric field in the beam. How would you determine the intensity if you knew the total power and the cross-sectional area of the beam?
(b) What total energy is contained in a 1.00-m length of the beam?
(c) Find the momentum carried by a 1.00-m length of the beam.