Heat and Mass Transfer
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

Stefan's law
Kirchhoff's law
Planck's law
Wien's law

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Heat and Mass Transfer
Which of the following would lead to a reduction in thermal resistance?

In convection, stirring of the fluid and cleaning the heating surface.
In radiation, increasing the temperature and reducing the emissivity.
All of these
In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

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