the removal of energy or particles from a beam by the medium through which the beam propagates
energy transmitted in wave motion, especially electromagnetic wave motion
a wave in which the direction of displacement is perpendicular to the direction of propagation, as a surface wave of water
a longitudinal wave in an elastic medium, especially a wave producing an audible sensation
the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth
a particle having the same mass and spin as an electron but having a positive charge equal in magnitude to that of the electron's negative charge