A piece of iron is heated in a flame. If first becomes dull red, then becomes reddish yellow and fin

Question

A piece of iron is heated in a flame. If first becomes dull red, then becomes reddish yellow and finally turns to white hot. The correct explanation for the above observation is possible by using

Professor PC Thomas Classes · Answer

Wien's displacement law ($\lambda_{max} T = b$) explains the colour shift from red to white as temperature increases.