A diffuse surface is characterized by the spectral hemispherical emissivity distribution shown in the figure below, where ε1 ε2 = 0.10, and ε3 = 0.8. For a surface temperature of T, = 300 K, what is the emissive power for the surface? Ελ 0 2 5 4 6 λ (μm) E3 00 8 10 = 0.75.

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Radiation

Radiation can be described as the energy in the form of a particular matter or electromagnetic waves traveling in the air and can be in the form of light, sound, and heat. Radiation can be detected through special instruments like X-rays. The radiation from a cooler object is less intense as compared to the radiation from hot objects.