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A spherical tungsten piece of radius (1)...

A spherical tungsten piece of radius `(1)/(sqrt(pi)) cm` is suspended in an evacuated chamber maintained at `200 K`. The piece is maintained at `400 K` by heating it electrically. Find the rate at which the electrial energy must be supplied. The emissivity of tungsten is `0.50`, the Steafan constant `sigma` is `6.0 xx 10^(-8) W//m^(2)-K^(4)`

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