The main goal of studying physics is to understand fundamental laws of nature ranging from the microscopic objects such as atomic nuclei and elementary particles to the whole universe. Therefore, physics forms the foundation of other branches of science and technology. In the department of physics, research projects in various fields are carried out by two approaches, theories and experiments. Theoretical physics includes a few areas; elementary particle physics unravels the fundamental building blocks of matter and the origins of the universe. Nuclear physics studies the structure and properties of nuclei. Nonlinear dynamics investigates chaos and order of nature. Statistical physics studies the collective behavior of gas and liquid. Experimental physics includes atomic, nuclear, and solid state physics; atomic and nuclear physics investigate the properties of matter and their interactions between atoms and molecules. Solid state physics studies the structures and characteristics of semiconductors, magnetic materials, and metals. Optics and laser physics study the properties and utilization of light and related devices. Undergraduate students learn the basic principles of physics and are introduced to the current topics in broad fields. Graduate students are focused on their researches on specialized subjects depending on their advisors and thesis topics.