A 85 w sodiumlamp 589nm radiates energy uniformly in all, Ask an Expert

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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?

photons/m2s

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