Physics Glossary – H
Half Life The half-life of a radioactive isotope is the time it takes for half of an isotope to decay into another element. It is a measure of the stability of an isotope; the shorter the half life, the less stable the atom. Hertzsprung-Russell Diagram The H-R (Hertzsprung-Russell) diagram is a diagram used in stellar astronomy to plot the properties of stars. There are two equivalent forms. One is the observer’s form which plots the color of the star on one axis and the absolute magnitude on the other axis. Holography Holography (from the Greek, holos whole + graphe writing) …