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 x/8 where x = _ _ _. (Given σ=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.)

Thermodynamics: JEE Main 2025 Physics question

JEE Main 2025 · 7 Apr, Morning shift · Q47

JEE Main 20257 Apr, Morning shiftPhysicsMediumThermodynamics163× since 2002

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 x8

where x = ______. (Given

\sigma=6.0\times10^{-8}

W m

^{-2}

^{-4}

\pi=3.14

and assume that the emissivity of wire material is same at all wavelength.)

Your answerType your answer. Integers and decimals are accepted.

JEE Main 2025 Thermodynamics Question with Solution (7 Apr Morning shift, Q47) | JEE Arc