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Transmission of Heat — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsTransmission of Heat1 Mark
Question
Assertion : Blue star is at high temperature than red star.
Reason : Wein's displacement law states that $T \propto\left(1 / \lambda_m\right)$.
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Answer

(a) From Wein's displacement law, temperature $(T) \propto 1 / \lambda_m$(where(\lambda_m$ is the maximum wavelength). Thus temperature of a body is inversely proportional to the wavelength. Since blue star has smaller wavelength and red star has maximum wavelength, therefore blue star is at higher temperature then red star.

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