When a blackened platium wire is heated gradually, it apears

Options

A. first blue, then red and finally white
B. first red, then blue and finally white
C. first white, then blue and finally red
D. first red, then white and finally blue

Explanation

(b) According to Wien's law
`lamda_(m)T=`constant
When temperature increases, wavelength decreases.
Due to his colour of object appears first red(of longer wavelength) then blue (shorter wavelength) and finally white (all wavelengths)