A meter to measure the power of a laser beam is
Chapter 13, Problem 13.33(choose chapter or problem)
A meter to measure the power of a laser beam is con-structed with a thin-walled, black conical cavity that iswell insulated from its housing. The cavity has anopening of D?10 mm and a depth of L?12 mm.The meter housing and surroundings are at a tempera-ture of 25.0?C. A fine-wire thermocouple attached to the surface indi-cates a temperature rise of 10.1?C when a laser beamis incident upon the meter. What is the radiant flux ofthe laser beam, Go(W/m2)?
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