If the absorption coefficient and reflection coefficient of a surface of a body are `0.4` and `0.6` respectively then:-
If the absorption coefficient and reflection coefficient of a surface of a body are `0.4` and `0.6` respectively then:-
A. Emissive power will be `0.2`
B. Transmission power will be `0.2`
C. Body will be be totally transparent
D. Body will be totally opaque.
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Correct Answer - D
For a grey body
` a + r +t = 1 ` if `alpha =0.4 ,r= 0.6`
then ` t=1-0.4 - 0.6 = 0`
The body is opaque
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