Photon Question-Energy Quantization Question-

[quickclick330]

Photon Question-Energy Quantization Question---please help!

This is a somewhat simple question I'm just unsure what relations to use. I found an equation relating number of protons to power and frequency but I'm not sure how to apply it to this case.

EQUATION?

Power = energy per unit time
= (energy per photon) * (photon per unit time)
= (h*f) * (photons per unit time)

*where*
Power = wattage
h = Planck's constant
f = frequency.


QUESTION
A certain laser outputs pure red light (photon energy 1.8 eV) with power 550 milliwatts (0.55 watts). How many photons per second does this laser emit?
photons/s

-Thanks!

 

[Doc Al]

Looks like you have the correct relations. Just be sure to convert everything to standard units: eV to Joules, mW to Watts.