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What is the value of emissivity for white marble?

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+1 vote
in Mass Transfer by (37.1k points)
What is the value of emissivity for white marble?

(a) 0.96

(b) 0.95

(c) 0.94

(d) 0.93

I have been asked this question during an interview.

Asked question is from Emissivity in portion Modes and Diffusion of Mass Transfer

1 Answer

0 votes
by (39.8k points)
Right choice is (b) 0.95

To elaborate: It is based on evacuated glass tube collectors. Sunlight is absorbed by a selective surface.

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