An ordinary body A and a perfect blackbody B are maintained at the sam

1.	An ordinary body A and a perfect blackbody B are maintained at the same temperature. If the radiant power of A is 2 × 104 W/m2 and that of B is 5 × 104 W/m2 , what is the coefficient of emission (emissivity) of A ?
Answer» Data : R = 2 × 10⁴ W/m² , R_b = 5 × 10⁴ W/m² The coefficient of emission (emissivity) of A, e = \(\frac{R}{R_b}\) = \(\frac{2\times10^4W/m^2}{5\times10^4W/m^2}\) = 0.4

An ordinary body A and a perfect blackbody B are maintained at the same temperature. If the radiant power of A is 2 × 104 W/m2 and that of B is 5 × 104 W/m2 , what is the coefficient of emission (emissivity) of A ?

Answer»

Data : R = 2 × 10⁴ W/m² , R_b = 5 × 10⁴ W/m²

The coefficient of emission (emissivity) of A,

e = \(\frac{R}{R_b}\) = \(\frac{2\times10^4W/m^2}{5\times10^4W/m^2}\) = 0.4