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

Physics
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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.
c.
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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