Question

If the emissive and absorptive powers of a body are $E$ and $A$ respectively at temperature $T$ then emissive power of a black body will be

• A. $E/A$
• B. $EAT$
• C. $EA/T$
• D. $A/E$

Answer 1

The correct option is A $E/A$

If Emissive power =$E$
Absorptive power = $A$
The emissive power of a black body is the emissive power for unit absorptive power(per unit absorptive power) (Black body absorbs all radiations) = $\frac{E}{A}$