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70. Find the power P of electric current supplied to the tungsten filament diameter d = 0,5 mm and a length ℓ = 20 cm in order to maintain its temperature 3000 K is that the heat lost by radiation only. Ambient temperature 1000 K. The coefficient of thermal emission 0,3 tungsten.
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- Content description 28 kB
- Added to the site 30.03.2014
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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)
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Solving a problem in physics section 18 paragraph 70 qu
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