How can u find the Number of Photons ( IN General ) assuming tht he gave u the energy??
jus divide the energy by charge, that is for example, i hav 2 joules of energy, so my photons will b 2/1.6x10^-19 which is gonna b a huge number, so don't worry,cause the energy given out by each photon is really low.
jus remember this, if u want to find the photon, then its energy divided by charge, if u want to find the energy, then its photon x charge