Photon Question-Energy Quantization Question-

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    Photon Quantization
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To determine the number of photons emitted per second by a laser outputting red light at 1.8 eV with a power of 550 milliwatts, the relevant equation is Power = (h*f) * (photons per unit time). First, convert the energy from electron volts to joules and the power from milliwatts to watts. Using Planck's constant, the frequency can be calculated, which allows for the determination of the photon emission rate. The final calculation will yield the number of photons emitted per second. Proper unit conversion is essential for accurate results.
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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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