Which term best represents the relation between a blackbody and radiant energy? A blackbody is an ideal _______ of radiant energy.

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Consider the question: Which term best represents the relation between a blackbody and radiant energy? A blackbody is an ideal _______ of radiant energy.
Option 1: 'absorber' — While a blackbody is known for its perfect absorption of incident radiant energy, this option alone doesn’t capture the full relation to radiant energy, since a blackbody also emits radiation according to its temperature.
Option 2: 'emitter and absorber' — This choice correctly reflects the dual role of a blackbody: it absorbs all incident radiant energy (perfect absorber) and, when in thermal equilibrium, it also emits radiation according to blackbody radiation laws. The term 'emitter and absorber' captures both aspects of the interaction with radiant energy.
Option 3: 'reflector' — A true reflector would primarily bounce energy with minimal absorption. A ideal blackbody, by definition, does not reflect significant radiant energy, so this description is inconsistent with its properties.
Option 4: 'emitter' — Although a blackbody emits radiation, focusing only on emission ignores its defining characteristic of perfect absorption. Emission alone does not describe its complete relation to radiant energy.
In summary, the best-fit term must acknowledge both absorption and emission properties of a blackbody in relation to radiant energy, aligning with the concept of a perfect absorber that also serves as an emitter according to its temperature.

SPHY001 Practice Quiz - Unit 14 | LA054

Which term best represents the relation between a blackbody and radiant energy? A blackbody is an ideal _______ of radiant energy.

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