Question

A helium-neon laser produces a beam of diameter 1.75 mm, delivering 2.90 x 1018 photons/s. Each photon has a wavelength of 633 nm (a) Calculate the amplitude of the electric field inside the beam. kV/m (b) Calculate the amplitude of the magnetic field inside the beam (c) If the beam shines perpendicularly onto a perfectly reflecting surface, what force does it exert on the surface? nN (d) If the beam is absorbed by a block of ice at 0°C for 1.00 h, what mass of ice is melted?