Question

For an atherminous substance with a, r and t being coefficient of absorption, reflection and transmission respectively. If a = 0.3. Which of the following is correct?



t= 0.35 and r= 0.35

r = 0.7

t = 0.7

a = 0 for atherminouse so a can't be 0.3

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Answer 1

Answer:

ANSWER

We haave

a+r+t=1

where

a=Coefficient of absorption

r=0.22=Coefficient of radiation

t=0.04=Coefficient of transmission

a+0.22+0.04=1

a=0.74

Now,

Qa=aQ=0.74×250=185 J

Therefore radiant heat absorbed is 185 J

Explanation:

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