2. Two very long concentric cylinders of diameters D=0.35 m and D2=0.5 m are maintained at uniform temperatures of T1 = 950 K and T2 = 500 K and have emissivities ɛ1 = 1 and ɛ2 = 0.55, respectively. Determine the net rate of radiation heat transfer between the two cylinders per unit length of the cylinders. What happens if the properties are just reversed.

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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.