2.a. What is the total Power emitted (in the form of electromagnetic radiation) by a solid hemisphere of emissivity, e = 1, if its radius is 0.70m, and it is maintained at a temperature of 1280 K ?
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- Q.10. The intensity of the radiation from an object is found to be a maximum at 2000 cm-1. Assuming that the object is a black body, calculate its temperature. Q.11. The intensity of the radiation from an object is found to be a maximum at 282 GHz (1A half cylindrical shell with a radius of 75 cm is held at 200°C and has an emissivity of 0.4. A long 200°C R= 75 cm cylinder has a diameter of 30 cm and is placed 20°C E= 0.4 D= 30 cm concentrically with the shell. The cylinder is radiatively black. At the instant the cylinder is 20°C, how much heat is exchanged from the shell to the cylinder, per meter length into the page, i.e., Qshell-eylinder/L.Define the absorption of radiation incident on an opaque surface of absorptivity α.
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