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Heat Transfer - Engineering

Q1:

The sum of reflectivity and absorptivity for an opaque body is equal to

A 0.5

B 1

C 0

D 2

ANS:B - 1

For an opaque body, the sum of reflectivity (R) and absorptivity (A) is equal to 1. This is because an opaque body absorbs all incident radiation that falls on it, so the sum of the fraction of radiation that is reflected (R) and the fraction that is absorbed (A) must equal 1. Any radiation that is not reflected is absorbed by the body. So, the correct answer is: 1