PHYSICS · Multi-part · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter
Problem
Two identical steel cubes are heated in a furnace. One appears dull red, corresponding to a peak emission wavelength of approximately 800nm, while the other appears bright yellow, corresponding to a peak emission wavelength of approximately 580nm.
(i) Which cube is at the higher absolute temperature? Give a brief reason without any calculation.
(ii) Explain qualitatively how the observed colour of thermal radiation from a blackbody changes as its temperature rises from about 1000K to 6000K.
(iii) Name the physical law that relates the wavelength corresponding to maximum intensity to the absolute temperature of a blackbody.