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The emissivity of tungsten is 0.4. A tun...

The emissivity of tungsten is 0.4. A tungsten sphere with a radius of 4.0 cm is suspended within a large evacuated enclosure whose walls are at 300 K. What power input is required to maintain the sphere at a temperature of 3000 K if heat conduction along supports is neglected ?
Take, `sigma = 5.67 xx (10^-8) Wm^2-K^4`.

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