Transmission Of Heat Question 326
Question: At a specific temperature, the energy densities for a black body for three different wavelengths are 10, 19 and 7 units. For these wavelengths if the absorption coefficient of a body is respectively 0.8, 0.3 and 0.9 then the emissive powers of this body for these wavelengths are in the ratio
Options:
A) 10 : 19 : 7
B) 8 : 3 : 9
C) 8 : 5.7 : 6.3
D) 8 : 9.5 : 4.3
Show Answer
Answer:
Correct Answer: C
Solution:
[c] Emissive power $ =a\in $
$ a _{1}{\in _{1}}:a _{2}{\in _{2}}:a _{3}{\in _{3}} $
$ \Rightarrow $ $ 10\times \frac{8}{10}:\frac{3}{10}\times 19:7\times \frac{9}{10} $
$ \Rightarrow $ $ 8:5.7:6.3 $
BETA
