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NEET 2020 (Phase 2) · Thermal Radiation: Black Body, Stefan & Wien

Thermal Radiation: Black Body, Stefan & Wien question from NEET 2020 (Phase 2)

Q96NEET 2020 · PHASE 2Easy

Thermal Radiation: Black Body, Stefan & Wien

Three stars $A, B, C$ have surface temperatures $T_{A}, T_{B}, T_{C}$ respectively. Star $A$ appears bluish, star $B$ appears reddish and star $C$ yellowish. Hence,

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Answer: (a)

Wien's law: $T \propto \dfrac{1}{\lambda_m}$ .
Wavelengths: blue < yellow < red, so $\lambda_A < \lambda_C < \lambda_B$ .
Hence $T_A > T_C > T_B$ , so the answer is (a).

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