The filament temperature of a light bulb is 2,050 K when the bulb delivers 40 W

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The filament temperature of a light bulb is 2,050 K when the bulb delivers 40 W of power. If its emissivity remains constant, what power is delivered when the filament temperature is 2,400 K?

a.
b.
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d.
e.
Jun 28th, 2015

Thank you for the opportunity to help you with your question!

Power is proportionate to temperature raised to the power 4. 

(P/40)= (2400/2050)^4

= 40 x (2400/2050)^4

P= 75W

Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 28th, 2015

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