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## Homework Statement

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?

## Homework Equations

E=hf

photon flux=#of photons/m2.s

## The Attempt at a Solution

I tried relating the area of the absorbing surface to the distance.