Photon Question-Energy Quantization Question-

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SUMMARY

The discussion centers on calculating the number of photons emitted per second by a laser outputting red light with a photon energy of 1.8 eV and a power of 550 milliwatts (0.55 watts). The relevant equation is derived from the relationship between power, energy per photon, and the number of photons emitted per unit time: Power = (h*f) * (photons per unit time). To solve the problem, it is essential to convert energy from electronvolts (eV) to joules (J) and power from milliwatts (mW) to watts (W).

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

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