Consider steady heat transfer between two large parallel plates at constant peratures of T1= 290 K and 72 = 150 K that are L= 2 cm apart. Assuming the faces to be black (emissivity 1), determine the rate of heat transfer between the tes per unit surface area, assuming the gap between the plates is (a) filled with nospheric air k = 0.01979 W/m °C, (b) evacuated, (c) filled with fiberglass ulation and k = 0.036 W/m-°C, and (d) filled with superinsulation having an parent thermal conductivity of 0.00015 W/m. °C

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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.