A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727^{\circ} {\C} and power radiated by the wire is 94.2 W . Its emissivity is \frac{x}{8} where {\x}= \_\_\_\_ . (Given \sigma=6.0 \times 10^{-8} {\Wm}^{-2} {\K}^{-4}, \pi=3.14 and assume that the emissivity of wire material is same at all wavelength.) [7 Apr 2025 Shift 1]

Thermodynamics Part 5

Section: Physics

Question : 28 of 69

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A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727∘C and power radiated by the wire is 94.2 W . Its emissivity is ‌

where x= ____ .
(Given σ=6.0×10−8Wm−2K−4,π=3.14 and assume that the emissivity of wire material is same at all wavelength.)

[7 Apr 2025 Shift 1]

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