NEET 2013 Physics question
A piece of iron is heated in a flame. It 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 -
Answer: (2)
Solution
Wien's displacement law states , so the wavelength at which emission is maximum shifts to shorter wavelengths as temperature rises. As the iron gets hotter the dominant colour therefore changes from red (long wavelength) to yellow
See the full step-by-step solution
Create a free account to read the complete working, and practise questions like this in a timed test.
Create a free account