The diameter of the tungsten filament in the light bulb

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The diameter of the tungsten filament in the light bulb d = 0.3 mm, the length of the spiral l = 5 cm. When the light bulb to the network voltage U = 127 V lamp current flows through I = 0,31 A. Find the temperature T coil. Considers that the establishment of equilibrium in all liberated filaments heat is lost by radiation. The ratio of the energy of tungsten luminosity and blackbody temperature for a given k = 0,31.

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Task 50339. Detailed solution with a short recording conditions, laws and formulas used in the decision, the withdrawal of the calculation formula and the answer.
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