An argon laser emits light of wavelength 488 nm at power of 100 mW (milliwatt). Calculate the energy of the photons that are emitted. If one focus the light onto a surface using a microscope objective to a circle with diameter 5 μm (micrometer), what is the power density of the light at unit W/m2 . Calculate the number of photons emitted by the laser in ten seconds. What is the photon flux of the focused beam in 1 Å2 , roughly the area of one atom, in unit photon/s/Å2 I got 245x10^17 photons/second
Having trouble with the rest!