Q.

Kirchhoff's law states that

• AThe total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature
• BThe wave length corresponding to the maximum energy is proportional to the absolute temperature
• CThe ratio of the emissive power and absorptive power of all bodies is the same and is equal to the emissive power of a perfectly black body
• DNone of the above