Final answer:
In physics, a theory is a well-developed set of ideas that provide an explanation for observed phenomena, such as the atomic theory and are thoroughly tested and confirmed.
Step-by-step explanation:
A theory is a body of statements that systematize knowledge of and explain phenomena. In the realm of science, particularly in physics, a theory is a well-developed set of ideas that propose an explanation for observed phenomena. For instance, the atomic theory proposed by Dalton is a comprehensive explanation based on scientific principles that explain the properties of matter. Theories are not mere speculations; they are thoroughly tested and confirmed explanations for observations or phenomena. As our understanding of physics grows, scientists seek to expand the body of knowledge and refine the laws and theories that describe it. The scope of physics, derived from the Greek word 'phüsis' meaning 'nature,' is concerned with describing the fundamental interactions of energy, matter, space,