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Introductory Physics Homework Help
Photons per Unit Volume (Quantum)
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[QUOTE="cepheid, post: 4349013, member: 4200"] If rho is the energy per unit volume (and per unit frequency interval), then to get the number of photons per unit volume and per unit frequency interval, you'd have to divide by the energy per photon. Also, you're thinking about the integral wrong. It doesn't make sense to have lambda and d(lambda) as limits in an integral, since the whole point of d(lambda) is that it represents an "infinitesimal" wavelength interval (it's not a number). You integrate once you want to get the change over some finite wavelength interval, like between lambda1 and lambda2. Conceptually, at least, this operation corresponds to adding up all the changes in all the little infinitesimal intervals within that finite wavelength range. [/QUOTE]
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Photons per Unit Volume (Quantum)
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