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Question
The emissivity of a body varies from
The emissivity of a body varies from
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Solution
The correct option is B zero to one
The emissivity of a body is defined as the ratio of the emissive power of a body to that of a perfectly black body. Perfectly black bodies are the best emitters in the universe. Nothing can have greater emissive power than a black body. Hence the ratio can never be greater than 1. Since power is a scalar quantity, it doesn't have a negative sign.
The emissivity of a body is defined as the ratio of the emissive power of a body to that of a perfectly black body. Perfectly black bodies are the best emitters in the universe. Nothing can have greater emissive power than a black body. Hence the ratio can never be greater than 1. Since power is a scalar quantity, it doesn't have a negative sign.
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