Question: 4 . Question: A spherical object with a diameter of 5 cm is heated to a temperature of 5 0 0 deg C .

4. Question: A spherical object with a diameter of 5 cm is heated to a temperature of 500\deg C. It is placed in a vacuum chamber where the temperature is maintained at 20\deg C. The emissivity of the object is 0.8, and its surface is assumed to be black. Calculate the rate of heat transfer from the object to the surroundings by radiation. Assume that the Stefan-Boltzmann constant is 5.67 x 10^-8 W/m^2K^4.

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