A) Wien's displacement law
B) Prevost theory of heat exchange
C) Newton's law of cooling
D) None of the above
Correct Answer: A
Solution :
According to Wein?s law \[{{\lambda }_{m}}T\]= constant, on heating up to ordinary temperatures, only long wavelength (red) radiation is emitted. As the temperature rises, shorter wavelengths are also emitted in more and more quantity. Hence the colour of radiation emitted by the hot wire shifts from red to yellow, then to blue and finally to white.
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