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Heat and Thermodynamics question

2025 · 7 Apr · Shift 1 · Q71
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  5. /2025 · 7 Apr · Shift 1 · Q71

Heat and Thermodynamics question

2025 · 7 Apr · Shift 1 · Q71

JEE MainPhysicsHeat and ThermodynamicsNumerical+4 / −1
A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is 1727∘C1727^{\circ} \mathrm{C}1727∘C and power radiated by the wire is 94.2 W . Its emissivity is x8\frac{x}{8}8x​ where x=x=x=‾\underline{\hspace{2cm}}​. (Given σ=6.0×10−8 W m−2 K−4,π=3.14\sigma=6.0 \times 10^{-8} \mathrm{~W} \mathrm{~m}^{-2} \mathrm{~K}^{-4}, \pi=3.14σ=6.0×10−8 W m−2 K−4,π=3.14 and assume that the emissivity of wire material is same at all wavelength.)
Numerical answer
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