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Standard XII

Physics

Energy Band Diagrams

Relation betw...

Question

Relation between emissivity $e$ and absorptive power $a$ is (for black body) :

e = a

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e = \frac{1}{a}

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e = a^{2}

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a = e^{2}

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Solution

The correct option is A $e = a$
For a black body , $e m i s s i v i t y$ = $a b s o r p t i v e p o w e r$ .Hence , $e$ = $a$ .

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The graph shown in the adjacent diagram, represents the variation of temperature (T) of two bodies, x and y having same surface area, with time (t) due to the emission of radiation. Find the correct relation between the emissivity ( $e$ ) and absorptivity ( $a$ ) power of the two bodies. (IIT JEE 2003)

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Relation between emissivity e and absorptive power a is (for black body) :

The correct option is A e=aFor a black body , emissivity = absorptive power.Hence ,e = a .

Relation between emissivity $e$ and absorptive power $a$ is (for black body) :

The correct option is A $e = a$
For a black body , $e m i s s i v i t y$ = $a b s o r p t i v e p o w e r$ .Hence , $e$ = $a$ .