Heat and Mass Transfer
If the energy radiated per second per sq. cm. of the surface for wave lengths lying between λ, and λ + dλ is represented by (eλ.dλ), then eλ is called

Emissive power
Absorptive power
None of these
Emissivity

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Heat and Mass Transfer
According of Kirchhoff's law

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

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