Compared to a blackbody at the same temperature, the emissivity of a real surface is:

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Multiple Choice

Compared to a blackbody at the same temperature, the emissivity of a real surface is:

Explanation:
Emissivity is the ratio of a surface’s actual thermal emission to the emission of a perfect blackbody at the same temperature. A blackbody is an ideal emitter, absorbing all incident radiation and radiating the maximum possible amount. Real surfaces aren’t perfect emitters—they reflect and sometimes transmit some energy—so they emit less than a blackbody. Since emissivity cannot exceed 1, real materials have emissivity less than a blackbody in general.

Emissivity is the ratio of a surface’s actual thermal emission to the emission of a perfect blackbody at the same temperature. A blackbody is an ideal emitter, absorbing all incident radiation and radiating the maximum possible amount. Real surfaces aren’t perfect emitters—they reflect and sometimes transmit some energy—so they emit less than a blackbody. Since emissivity cannot exceed 1, real materials have emissivity less than a blackbody in general.

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