What are all the branches and sub branches of physics?
Physics can be broadly categorized into classical physics (including mechanics, thermodynamics, and electromagnetism) and modern physics (including relativity, quantum mechanics, and particle physics). These branches are further subdivided into various subfields like astrophysics, biophysics, condensed matter physics, nuclear physics, and optics, among others. Each subfield focuses on specific phenomena and has its own set of theories and principles.