Discuss the below:
Q: A large body of non-luminous gas at a temperature of 1200 K has emission bands between 2.5 and 3.5μm and between 5 and 8μm. The effective emissivity in the first band is 0.8 and in the second 0.6. Determine the emissive power of this gas. You must provide the solution of the problem step by step.You need to include all the calculation.