COMEDK2017PhysicsThermal Properties of Matter
A piece of blue glass heated to a high temperature and a piece of red glass at room temperature are taken inside a dimly lit room. Then
Options
- Athe blue piece will look blue and red will look as usual
- Bred will look brighter red and blue will look ordinary blue
- Cblue will shines like brighter red compared to the red piece
- DBoth the pieces will look equally red
Correct answer
C. blue will shines like brighter red compared to the red piece
Step-by-step solution
When blue glass is heated to a high temperature, it absorbs all radiations of higher wavelength except red. So, when it is taken inside a dimly lit room, it emits all radiations and hence looks brighter red compared to the red piece. This happens according to Kirchhoff's law of radiation.