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- Thread starter blokeice
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Have you looked at http://en.wikipedia.org/wiki/%C4%8Cerenkov_radiation?

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[tex] dN=\frac{1}{137}\left(1-\frac{c^2}{n^2v^2} \right)\frac{d\omega}{c} \text{ photons per unit length}[/tex] which becomes for infinite index of refraction

[tex] dN=\frac{1}{137}\frac{d\omega}{c} \text{ photons per unit length}[/tex]

So the total number of quanta depends on wnat interval the frequency interval dω covers. Normally, the index of refraction is n ≤1 for wavelengths less than ~ 1000 Angstroms (UV).

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