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Topic: Help calculating Photons  (Read 2449 times)

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Offline T33

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Help calculating Photons
« on: November 28, 2017, 09:01:00 PM »
Ultraviolet light emits a total of 2.5x10–17 J of light at a wavelength of 9.8x10–7 m.  How many photons does this correspond to?

Would I use the equation E=hc/λ ?

I know E= 2.5x10–17 J
and wavelength= 9.8x10–7 m

but the equation i'm plugging into doesn't seem correct. Also would I need to divide by Avogadro's # to get photons?
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Offline Corribus

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Re: Help calculating Photons
« Reply #1 on: November 28, 2017, 10:32:01 PM »
You seem to be confusing your energies, of which there are two you need to worry about: the total energy of the (beam of) light, and the energy of each photon. Do you know which one of these the equation you listed corresponds to?
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Offline Enthalpy

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Re: Help calculating Photons
« Reply #2 on: November 29, 2017, 05:50:51 PM »
Since when is 0.98µm ultraviolet????
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