A nearly cylindrical laserbeam impinges normally on a perfectly absorbing surface. The irradiance of the beam (assuming
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A nearly cylindrical laserbeam impinges normally on a perfectly absorbing surface. The irradiance of the beam (assuming it to be uniform over its cross section) is 40 W/cm2. If the diameter of the beam is 2.0/√π cm how much energy is absorbed per minute?
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Talha Talib
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