sir..urgent..plz answer..

Asked by  | 17th Sep, 2011, 01:00: PM

Expert Answer:

The "rate of emission of quanta" means the number of quanta per second.
Energy of photon = h x c / lambda (wavelength)
Power = change in energy / change in time
Surface area of sphere = 4?r

Answered by  | 17th Sep, 2011, 11:57: PM

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