MHT CET 2025 Physics question

For a perfectly black body, coefficient of emission is

(A)zero
(B)unityCorrect
(C)less than one (non-zero)
(D)infinity

Answer: (B)

Solution

The coefficient of emission (emissivity) of a body is the ratio of the energy it radiates to the energy a perfect black body radiates at the same temperature. A perfect black body is the best possible absorber and emitter, so it radiates the maximum possible energy and its

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Question ID VK-101256