An electric current through a tungsten filament maintains its temperature at 2800 K. Assume the tungsten filament behaves as an ideal radiator at that temperature

If the radiating area of the filament is 2.0 × 10-6 m2, at what rate does it radiate energy? (? = 5.670 × 10-8 W/m2 ? K4, Wien displacement law constant is 2.90 × 10-3 m ? K)
A) 11.5 W B) 7.0 W C) 8.5 W D) 5.5 W E) 10 W


B

Physics & Space Science

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Iron meteorites are believed to come from

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A calculus book weighing 20 N rests on the floor of a classroom. The reaction to the force of the floor on the book is a force of

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