What is the rate of energy radiation per unit area of a blackbody a a temperature of?

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What is the rate of energy radiation per unit area of a blackbody a\ a temperature of?
(a) 273 K and
(b) 2730 K?
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Fundamentals of Physics

ISBN: 978-0471758013

8th Extended edition

Authors: Jearl Walker, Halliday Resnick

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