| Consider the following statements regarding emission of heat radiation by a substance. |
| I. Radiation occurs in solids, liquids and gases. |
| II. In solids and liquids radiation is a surface phenomena. |
| III. In liquids radiation is a surface phenomena. |
| IV. In all fluids radiation is a volumetric phenomena. |
| Which of the above statements are correct? |
A) Statements I, II and III are correct
B) Statements I, II and IV are correct
C) Statements II and III are correct
D) Only statement IV is correct
Correct Answer: A
Solution :
All substances emits radiation. In general radiation is a volumetric phenomena but in solids and liquids emitted radiation by a molecule deep inside matter is absorbed by surrounding molecules and dissipation of energy occurs only from surface.
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