Question: (a) How much power is radiated by a tungsten sphere (emissivity = 0.35) of radius 19 cm at a temperature of 25C? (b) If

(a) How much power is radiated by a tungsten sphere (emissivity ε = 0.35) of radius 19 cm at a temperature of 25°C?

(b) If the sphere is enclosed in a room whose walls are kept at - 5° C, what is the net flow rate of energy out of the sphere?

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