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Which one of the following statements correctly describes emissivity e in the Stefan-Boltzmann law of radiation? The emissivity depends on the surface area of the

Which one of the following statements correctly describes emissivity e in the Stefan-Boltzmann law of radiation? The emissivity depends on the surface area of the object. The emissivity is zero for a perfect blackbody. The emissivity is a dimensionless quantity. The emissivity is negative in the infrared region

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