Final answer:
The assimilation and conversion of radiation energy by a material is indeed called absorption, which is a fundamental concept in understanding how radiation interacts with matter.
Step-by-step explanation:
The statement that the assimilation of radiation and its conversion from one form to another is termed absorption is true. Radiation involves the transfer of energy through the emission and absorption of electromagnetic waves. When a material absorbs radiation, it means the energy from the radiation is taken up by the material's atoms or molecules and is often converted to heat or causes a physical change in the absorbing substance, for instance causing electrons to move to a higher energy level, which can lead to phenomena like the photoelectric effect.
The assimilation of radiation and its conversion from one form to another is termed absorption. So, the statement is true. When radiation is absorbed, its energy is converted into another form, such as heat or electrical energy. This process is commonly observed when sunlight is absorbed by a dark object, heating it up.