The surface area of the tungsten filament 25 watt

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The surface area of the tungsten filament 25 watt vacuum tube is 0.403 cm ^ 2, and its filament temperature 2177 ° C. How many times less energy emits light than a black body of the same surface at the same temperature? Considers that, in a balance, all the heat released in the thread is lost by radiation.

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Task 50127. Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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