4. Which of the following statement is correct? a. At thermal equilibrium, the emissivity and absorptivity are the same. b. A grey body is one, which absorbs all radiations incident on it c The energy absorbed by a body to the total energy falling on it, is called emissivity. d. A perfect body is one, which is black in colour.

4. Which of the following statement is correct? a. At thermal equilibrium, the emissivity and absorptivity are the same. b. A grey body is one, which absorbs all radiations incident on it c The energy absorbed by a body to the total energy falling on it, is called emissivity. d. A perfect body is one, which is black in colour.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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Concept explainers

Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.

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4.
Which of the following statement is correct?
a. At thermal equilibrium, the emissivity and absorptivity are the same.
b. A grey body is one, which absorbs all radiations incident on it
c. The energy absorbed by a body to the total energy falling on it, is called emissivity.
d. A perfect body is one, which is black in colour.

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