(adsbygoogle = window.adsbygoogle || []).push({}); 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!!

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Photon Question-Energy Quantization Question-please help!

**Physics Forums | Science Articles, Homework Help, Discussion**