How much power is radiated with a tungsten sphere, Physics

How much power is radiated with a tungsten sphere

a) How much power is radiated with a tungsten sphere (emissivity e= 0.35) of radius 22cm at a temperature of 25 degrees celsius.

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

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