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  4. Let there be four articles having colours blue, red, black and white. When they are heated together and allowed to cool, which article will cool at the earliest?

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Q. Let there be four articles having colours blue, red, black and white. When they are heated together and allowed to cool, which article will cool at the earliest?

MGIMS WardhaMGIMS Wardha 2005

Solution:

According to wein's law $ T\propto \frac{1}{\lambda } $ Red colour have maximum wavelength, so its temperature will be minimum and hence it will cool at the earliest.