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2.34. A collimated light beam of flux density 10 W/cm 2 impinges normally on a p

ID: 2010216 • Letter: 2

Question

2.34. A collimated light beam of flux density 10 W/cm2 impinges normally on a perfectly absorbing planar surface of area 1 cm2. If this occurs for 1000 s, how much energy is imparted to the surface?

2.35. A focused CO2 laser beam putting out a continuous wave (0 = 10,600 nm) of 3 kW is capable of burning a hole through a quarter-inch thick stainless steel slab in about 10 seconds. Determine the irradiance when such a beam has a focused spot area of 10-5 cm2. What is the electric field amplitude?

Explanation / Answer

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2.34 A model for the automatic gage control (AGC) system of a steel rolling mill
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