A YAG laser is an extremely powerful laser. Each pulse of light contains 5.50 Joules of energy. If the wavelength is 1.064 um (micrometers), how many moles of photons are contained within each pulse?
According to the difination, the mole is defined as the amount of substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons) as there are atoms in 0.012 kg of the isotope carbon-12. In the difination can we include the photons? What is the molecular weight of the photon?