Optics is a branch of physics that studies the behavior and properties of light, including its interactions with matter and the construction of instruments that use or detect it. Sonics is a branch of physics that deals with the study of sound and its properties, including its production, transmission, and reception. QUANTUM physics is a branch of physics that studies the behavior of matter and energy at the atomic and subatomic level. Condensed Matter Physics is a branch of physics that studies the physical properties of condensed phases of matter, such as solids and liquids.