A copper sphere of 1.01m diameter is coated with lamp black and maintained at a temperative of 513⁰K. flow much energy is radiated in two minutes ? (Stefan's constant = 5.7 x 1081/m²k²s).

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A copper sphere of 1.01m diameter is coated with
lamp black and maintained at a temperative of
513° K. flow much energy is radiated in two
minutes ? (Stefan's constant = 5·7x10°³f/m²k²s).
Transcribed Image Text:A copper sphere of 1.01m diameter is coated with lamp black and maintained at a temperative of 513° K. flow much energy is radiated in two minutes ? (Stefan's constant = 5·7x10°³f/m²k²s).
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