A_METAL_SPHERE_OF_SURFACE_AREA_0.0225_M2_IS_IN_AN_EVACUATED_ENCLOSURE_WHOSE_WALLS_ARE_HELD_AT_A_VERY_LOW_TEMPERATURE._ELECTRIC_CURRENT_IS_PASSED_THROUGH_RESISTORS_EMBEDDED_IN_THE_SPHERE_CAUSING_ELECTRICAL_ENERGY_TO_BE_DISSIPATED_AT_THE_RATE_OF_75_W._IF_THE_SPHERE_SURFACES_TEMPERATURE_IS_MEASURED_TO_BE_560_K,_WHILE_IN_STEADY_STATE,_CALCULATE_EMISSIVITY_OF_THE_SPHERE_SURFACE?$

A_METAL_SPHERE_OF_SURFACE_AREA_0.0225_M2_IS_IN_AN_EVACUATED_ENCLOSURE_

1.	A_METAL_SPHERE_OF_SURFACE_AREA_0.0225_M2_IS_IN_AN_EVACUATED_ENCLOSURE_WHOSE_WALLS_ARE_HELD_AT_A_VERY_LOW_TEMPERATURE._ELECTRIC_CURRENT_IS_PASSED_THROUGH_RESISTORS_EMBEDDED_IN_THE_SPHERE_CAUSING_ELECTRICAL_ENERGY_TO_BE_DISSIPATED_AT_THE_RATE_OF_75_W._IF_THE_SPHERE_SURFACES_TEMPERATURE_IS_MEASURED_TO_BE_560_K,_WHILE_IN_STEADY_STATE,_CALCULATE_EMISSIVITY_OF_THE_SPHERE_SURFACE?$
A.	0.498
B.	0.598
C.	0.698
D.	0.798
Answer» C. 0.698

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A_METAL_SPHERE_OF_SURFACE_AREA_0.0225_M2_IS_IN_AN_EVACUATED_ENCLOSURE_WHOSE_WALLS_ARE_HELD_AT_A_VERY_LOW_TEMPERATURE._ELECTRIC_CURRENT_IS_PASSED_THROUGH_RESISTORS_EMBEDDED_IN_THE_SPHERE_CAUSING_ELECTRICAL_ENERGY_TO_BE_DISSIPATED_AT_THE_RATE_OF_75_W._IF_THE_SPHERE_SURFACES_TEMPERATURE_IS_MEASURED_TO_BE_560_K,_WHILE_IN_STEADY_STATE,_CALCULATE_EMISSIVITY_OF_THE_SPHERE_SURFACE?$
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