№ 31.67

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Uploaded: 15.01.2016
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Ignoring losses on heat conductivity, to find power of electric current, necessary for incandescence of filament the diameter of a 1 mm and long a 20 cm to the temperature 2500 Kelvin. To consider that a filament radiates, as a black body and after establishment of equilibrium the amount of warmth all distinguished in a filament is lost on a radiation.

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