A) the nature of its surface
B) the area of its surface
C) the temperature of its surface
D) All the above factors
Correct Answer: C
Solution :
The wavelength of radiation emitted by a body depends upon the temperature of its surface According to Wiens 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 the blue and finally to white.
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