IEVref:845-21-043ID:
Language:enStatus: Standard
Term: photon number
Synonym1: number of photons
Synonym2:
Synonym3:
Symbol: Np
Definition: quotient of radiant energy and photon energy

N p = Q e hν MathType@MTEF@5@5@+= feaagKart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaaa baaaaaaaaapeGaamOta8aadaWgaaWcbaWdbiaabchaa8aabeaak8qa cqGH9aqpdaWcaaWdaeaapeGaamyua8aadaWgaaWcbaWdbiaabwgaa8 aabeaaaOqaa8qacaWGObGaaGjbVlabe27aUbaaaaa@410D@

where Qe is radiant energy, h is the Planck constant, and ν is the frequency of the corresponding electromagnetic wave

Note 1 to entry: Photon number can also be expressed by the time integral of the photon flux, Φp, over a given duration, Δt:

N p = Δt Φ p dt MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaiqaciWacmGadaGadeaabaGaaqaaaOqaaiaad6eadaWgaaWcbaGaaeiCaaqabaGccqGH9aqpdaWdraqaaiabfA6agnaaBaaaleaacaqGWbaabeaaaeaaimaacqWFuoarcaWG0baabeqdcqGHRiI8aOGaaeizaiaadshaaaa@4138@

Note 2 to entry: The photon number has unit one.

Note 3 to entry: This entry was numbered 845-01-29 in IEC 60050-845:1987.


Publication date:2020-12
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