A perfect black body has an emissivity (its ratio of actual to maximum possible emission) equal to?

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1. A perfect black body has an emissivity (its ratio of actual to maximum possible emission) equal to?

The maximum possible value, unity

Zero

A value that varies randomly

The minimum possible value

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By definition, a perfect black body has an emissivity of exactly 1 — unity — the maximum possible value, meaning it emits radiation as efficiently as physically possible for its temperature.