Heat and Mass Transfer
Fouling factor is used

When a liquid exchanges heat with a gas
In case of Newtonian fluids
None of these
In heat exchanger design as a safety factor

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Heat and Mass Transfer
Kirchhoff's law states that

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
None of these
The wave length corresponding to the maximum energy is proportional to the absolute temperature
The total radiation from a black body per second per unit area is directly proportional to the fourth power of the absolute temperature

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