where E = hfand f = c/λare used. Here his the Planck constant, fis the frequency of the emitted light, and λis its wavelength. Thus, RPhc==××⋅×=×−−λ589 101006 63 10300 10296 10934820mWJsm/sphoton / s.chbgchch... (b) Let Ibe the photon flux a distance rfrom the source. Since photons are emitted uniformly in all directions, R= 4πr2Iand ()207422.96 10 photon/s4.86 10 m.441.00 10 photon/m s
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