A) Blue
B) Red
C) Black
D) White
Correct Answer: B
Solution :
From Wiens displacement law the relation between maximum wavelength \[{{\lambda }_{m}}\] and temperature \[T\] is \[{{\lambda }_{m}}T=\]constant Which implies that longer is the wavelength smaller the temperature is. Since, red colour has maximum wavelength, so its temperature will be minimum and hence, it will cool at the earliest.
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