Two concentric spheres of diameter D₁ = 0.8 m and D₂ = 1.2 m are separated by an air space and have surface temperatures of T₁ = 400 K and T₂ = 300 K.

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Q: PUB mat 12' 8¹ 12 C12 E 600 lb E 12 1000 lb FIG. 3 8' G 129 800 lb रायपोय

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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.