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Question

Which of the following has largest absorption coefficient?

A
heavy curtain
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B
cork
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C
marble
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D
open window
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Solution

The correct option is D open window
The absorption coefficient of a body is the ratio of the heat radiation absorbed by the body to the total heat radiation incident on it. Since an open window can allow all the radiation into it, it is a good absorber. Hence its coefficient is highest.

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