Heat and Mass Transfer
When heat is transferred from one particle of hot body to another by actual motion of the heated particles, it is referred to as heat transfer by

Radiation
Convection
Conduction
Conduction and convection

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Heat and Mass Transfer
Kirchhoff's law states that

The wave length corresponding to the maximum energy is proportional to the absolute temperature
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 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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