JEE Main 2025 — Thermal Properties of Matter Question with Solution
JEE Main 2025 (7 Apr Shift 1)
Question
A wire of length 10 cm and diameter 0.5 mm is used in a bulb. The temperature of the wire is and power radiated by the wire is 94.2 W. Its emissivity is where _______
(Given and assume that the emissivity of wire material is same at all wavelength.)
(Given and assume that the emissivity of wire material is same at all wavelength.)
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Show full solutionCorrect answer: 5
Correct answer
5
Step-by-step explanation
Power,
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This is a previous-year question from JEE Main 2025, covering the Thermal Properties of Matter chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.