A monochromatic plane wave given with the expression E =1000cos (2π·10^15t –βz) V/m is incident normally upon a 1 m^2 surface.
1. What is the wavelength of the photons?
2. What is the energy per photon?
3. How many photons strike the surface per second?
4. To what region of the electromagnetic spectrum do the photons belong?
5. If the wave propagates in vacuum and the surface it hits is that of a dielectric by refractive index n = 1.25, how many photons are reflected from the surface per second? How many are transmitted?