The total emissive power of a surface is 500 W/m2 at a temperature T1 and 1200 W/m2 at a temperature T2. Where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures \(\frac{{{T_1}}}{{{T_2}}}\) is

The total emissive power of a surface is 500 W/m2 at a temperature T1

1.	The total emissive power of a surface is 500 W/m2 at a temperature T1 and 1200 W/m2 at a temperature T2. Where the temperatures are in Kelvin. Assuming the emissivity of the surface to be constant, the ratio of the temperatures \(\frac{{{T_1}}}{{{T_2}}}\) is
A.	0.308
B.	0.416
C.	0.803
D.	0.874
Answer» D. 0.874