The emissivity of tungsten is 0.350. A tungsten sphere with a radius of 1.50cm is suspended inside a large evacuated cavity whose walls are at 290 K.A. What power input is required to maintain the sphere at 3000 K if heatconduction by the supports is neglected?B. If the power input to the sphere is less than the value calculated in theprevious point, what will happen to the equilibrium temperature of thesphere?C. Comment qualitatively, with respect to heat transfer, what wouldhappen if the supports that suspend the sphere are not negligible and thecavity where the sphere is located is not in vacuum but contains air.

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