Category 4D within foundational concept 4 of the Chemical and Physical Foundations of Biological Systems section of the MCAT primarily focuses on how both light and sound interacts with matter. Category 4D is the fourth of five content categories within foundational concept 4.
Overview of Foundational Concept 4, Category 4D
Light is a form of electromagnetic radiation, and its behavior depends on its frequency. When light interacts with matter, changes take place that can be used to sort material on an atomic or molecular level. Different levels of absorption of radiation can be used to make images that are useful in diagnostic medicine. This is just part of the information you will be tested on in category 4D as part of foundational concept 4.
According to the Association of American Medical Colleges, the topics and subtopics in category 4D include:
A time limit is not placed specifically on category 4D or foundational concept 4, but you will have a total of 95 minutes to complete Chemical and Physical Foundations of Biological Systems section of the MCAT exam.