The Filament Temperature of a Light Bulb Is 2 100

question 2

Multiple Choice

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

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