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The Speed of EM Waves

At a specific...

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 co-efficient of a body is respectively 0.8, 0.3 and 0.9 then the emissive power of this body for these wavelength are in the ratio:

A

10:19:7

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B

8:3:9

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C

8:5.7:6.3

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D

8:9.5:4.3

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Solution

The correct option is B 8:5.7:6.3
We know that $E m i s s i v e p o w e r$ = $E n e r g y d e n s i t y \times a b s o r p t i o n c o e f f i c i e n t$
So, $E_{1} : E_{2} : E_{3} = 8 : 5.7 : 6.3$

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