The filament temperature of a light bulb is 2 100 K when the bulb delivers 40.0 W of power. If its emissivity remains constant, what power is delivered when the filament temperature is 2 500 K?
a. 161 W
b. 121 W
c. 80.3 W
d. 60.3 W
e. 40.2 W
c
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