A beam of 6328 nm photons from a he-ne laser strikes a

A beam of 632.8 nm photons from a He-Ne laser strikes a detector area of 5.0 mm2. The laser has a flux of 3.18 x 1015 photons s-1.

(a) What is the laser radiant power in watts?

(b) What is the laser irradiance at the detector?

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