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 terms used to describe how radiant energy interacts with a material. These properties are crucial in understanding the behavior of materials, particularly in the context of solar energy applications.

1. Absorptivity (α):
   Absorptivity refers to the ability of a material to absorb radiant energy incident upon it. Mathematically, it is defined as the ratio of the absorbed radiant energy to the incident radiant energy. Essentially, absorptivity indicates how much of the incoming radiation is absorbed by the material. It ranges from 0 to 1, where 0 indicates complete reflectivity (no absorption) and 1 indicates complete absorption.

2. Reflectivity (ρ):
   Reflectivity, also known as reflectance, is the measure of how much radiant energy is reflected by ___ ___ ______ __________ ________ _______ _________ ______ ___ _________ _____ _________.
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