A 100W sodium lamp(lambda=589nm) radiates energy uniformly in all directions.
(A) At what distance from the lamp will a totally absorbing screen absorb photons at the rate of 1.00 photon/cm2.s?
(B) What is the photon flux on a small screen 2m from the lamp?
photon flux=#of photons/m2.s
The Attempt at a Solution
I tried relating the area of the absorbing surface to the distance.