A) blue star
B) yellow star
C) green star
D) red star
Correct Answer: A
Solution :
Key Idea: Apply Men's displacement law. From Wien's displacement law, \[{{\lambda }_{m}}T=\]constant where, \[{{f}_{o}}\] is maximum wavelength and \[T\] is absolute temperature. Since, wavelength of blue colour is minimum, hence, surface temperature of blue star is maximum. Note: Surface temperature will be minimum for red star.
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