IGNOU MRW 2 2026 - Define the following:a) Radiosityb) Absorptivityc) Reflect

Question

Define the following:

a) Radiosity

b) Absorptivity

c) Reflectivity

d) Transmissivity

e) Spectral Intensity

23 Apr 2026

Answer :

Word Count : 350

In thermal radiation, various surface and radiative properties are defined to describe how energy is emitted, absorbed, reflected, and transmitted by materials when exposed to electromagnetic radiation. Radiosity is defined as the total radiant energy leaving a surface per unit area. It includes both the energy emitted by the surface due to its temperature and the energy reflected from the surface after incident radiation. Thus, radiosity accounts for all outgoing radiation from a surface, making it an important parameter in radiation heat transfer analysis. J = E + \rho G where (J) is radiosity, (E) is emissive power, (\rho) is reflectivity, and (G) is the irradiation (incident radiation). Absorptivity

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