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a copper sphere is suspened in an evacuatd chamber at 300K. the sphere is maintained at 900 k by heating electrically. a total of 300w is needed to do dis. wen haf of d surface of copper is completely blackened to make dis portion completely absorbtive 600 w is needed to maintain same temp of sphere. the emissivity of copper is 1/4 1/3 1/2 1


a copper sphere is suspened in an evacuatd chamber at 300K. the sphere is maintained at 900 k by heating electrically. a total of 300w is needed to do dis. wen haf of d surface of copper is completely blackened to make dis portion completely absorbtive 600 w is needed to maintain same temp of sphere. the emissivity of copper is

1/4

1/3

1/2

1


Grade:9

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