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A 100 W sodium lamp is radiating light o...

A 100 W sodium lamp is radiating light of wavelength `5890A`, uniformly in all directions,
a. At what rate, photons are emitted from the lamp?
b. At what distance from the lamp, the average flux is 1 photon(`cm^2-s)^-1?`
c. What are the photon flux and photon density at 2m from the lamp?

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(a) `2.96xx10^(20)"photon/s,"` (b) `4.86xx10^(7)m,` (c) `5.89xx10^(18)("photons")/(m^(2).s)`
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