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## Homework Statement

A certain laser outputs pure green light (photon energy 2.5 eV) with power 500 milliwatts (0.5 watts). How many photons per second does this laser emit?

## Homework Equations

not exactly sure, I know that Watts are equal to Jouls/sec

and that the electronic energy of a hydrogen atom is -13.6eV/N^2

## The Attempt at a Solution

can someone run through this with me and give me a good explanation? do i convert .5 watts to eV and then divide that number by 2.5 eV?

3.121e+18(eV)/2.5 = 2.348e18?