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What is the value of emissivity for asphalt?

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+1 vote
in Mass Transfer by (38.2k points)
What is the value of emissivity for asphalt?

(a) 0.90

(b) 0.80

(c) 0.70

(d) 0.60

I have been asked this question in exam.

My query is from Emissivity in chapter Modes and Diffusion of Mass Transfer

1 Answer

0 votes
by (39.8k points)
Right choice is (a) 0.90

Easy explanation: It is an ordinary black surface that absorbs sunlight efficiently but emits thermal radiation copiously.

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