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Question

The absorptivity of Platinum black is

A
0.91
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B
0.98
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C
1
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D
0.99
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Solution

The correct option is A 0.98
The emissivity of Platinum black is 0.98. According to Kirchhoff's law of radiation, absorptivity is equal to emissivity at a given temperature. Hence, absorptivity = 0.98.

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