Health physics involves the protection of people work with are near radiation. Mathematical physics is the study of mathematical systems that stands for physical phenomena. Mechanics deals with the behavior of objects and systems in response to various forces. Molecular physics examines the structure, properties, and behavior of molecules. Nuclear physics is concerned with the structure and properties of the atomic nucleus, and with nuclear reactions and their applications.
Optics is the study of the nature and behavior of light.
Particle physics , also called high energy physics, analyses the behavior and properties of elementary particles. Plasma physics is concerned with the study of highly ionized gases- that is, gases that have been separated into positively and negatively charged particles. Quantum physics includes various areas of study based on quantum theory, which deals with matter and electromagnetic radiation, and the interactions between them. Thermodynamics is the study of heat and other forms of energy, and of the conversion of energy from one form to another.