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A 85 W sodiumlamp ( = 589nm) radiates energy uniformly in all directions.
(a) At what rate are photons emitted by thelamp?
photons/s
(b) At what distance from the lamp will a totally absorbing screenabsorb photons at the rate of 0.76photon/cm2s?
m
(c) What is the photon flux (photons per unit area per unit time)on a small screen 2.01 m from thelamp?
photons/m2s
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