Physics Glossary – G
Galvanometer An instrument for measuring small currents. When a current is passed through a coil in a magnetic field, the coil experiences a turning force proportional to the current. Gamma Rays Are an energetic form of electromagnetic radiation produced by radioactivity or other nuclear or subatomic processes such as electron-position annihilation. Gamma rays are more penetrating than either alpha or beta radiation, but less ionizing. They are a form of electromagnetic radiation. Gamma rays are distinguished from X rays by their origin. Gamma rays are produced by nuclear transitions while X-rays are produced by energy transitions due to accelerating electrons. …