According of Kirchhoff's law

A Radiant heat is proportional to fourth power of absolute temperature
B Emissive power depends on temperature
C Emissive power and absorptivity are constant for all bodies
D Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Correct Answer: Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body

Kirchhoff's law states that the emissivity and the absorptivity of a surface at a given temperature and wavelength are equal.The 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. This statement is known as Kirchhoff's law
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

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