Explain the terms absorptivity, reflectivity and transmissivity of radiant energy. How are they related to each other for a black body and an opaque body?

Absorptivity, reflectivity, and transmissivity are key concepts in the study of radiant energy and are essential for understanding how different materials interact with light and other forms of radiation. These properties help explain how energy is absorbed, reflected, or transmitted through materials, which is crucial for solar energy applications.

Absorptivity refers to the fraction of incident radiant energy that is absorbed by a material. It is a material's ability to convert incoming radiation into heat energy. The absorptivity of a material depends on its properties, such as color, texture, and surface composition. In the context of solar energy, materials with high absorptivity are typically used in solar collectors or panels to absorb sunlight and convert it into thermal energy or _____ _____ ____ _____ ____ ________ ______ ________ __________ __________ ____.
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