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प्रश्न
A perfect black body has an emissivity value of ______.
पर्याय
0
0.5
1
Infinity
MCQ
रिकाम्या जागा भरा
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उत्तर
A perfect black body has an emissivity value of 1.
Explanation:
Emissivity (e) is a measure of how efficiently a body emits thermal radiation compared to an ideal black body. For a perfect radiator (black body), e = 1, meaning it emits the maximum possible radiation at a given temperature.
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