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A spherical tungsten piece of radius 1 cm is suspended in an evacuated chamber maintained at 300 K. The piece is maintained at 1000 K by heating it electrically. Find the rate at which the electrical energy must be supplied. The emissivity of tungsten is 0.30 and the stefan constant, σ=6.0×10−8 Wm−2 K−4

Answer»

A spherical tungsten piece of radius 1 cm is suspended in an evacuated chamber maintained at 300 K. The piece is maintained at 1000 K by heating it electrically. Find the rate at which the electrical energy must be supplied. The emissivity of tungsten is 0.30 and the stefan constant, σ=6.0×108 Wm2 K4



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