| Definition: | quotient of the number of photons dNp emitted, transmitted, or received in an element of time dt, by that element
X
unit: s- 1
NOTE – For a beam of radiation whose spectral distribution is X or X the photon flux Φp is X
h, Planck's constant= (6,626 0755 ± 0,000 0040) x 10- 34 J • s
c0, speed of light in vacuum = 299792458 m • s- 1.
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