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Ray Of Light
  1. a column of light (as from a beacon)
  2. a column of light (as from a beacon)
Rest Energy
  1. the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
  2. the energy equivalent to the mass of a particle at rest in an inertial frame of reference; equal to the rest mass times the square of the speed of light
Reverse Lightning
  1. atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
Red Sprites
  1. atmospheric electricity (lasting 10 msec) appearing as globular flashes of red (pink to blood-red) light rising to heights of 60 miles (sometimes seen together with elves)
  2. atmospheric electricity (lasting 10 msec) appearing as globular flashes of red (pink to blood-red) light rising to heights of 60 miles (sometimes seen together with elves)
Radiation Field
  1. a field that represents the energy lost from the radiator to space
  2. a field that represents the energy lost from the radiator to space
Radiopacities
  1. opacity to X-rays or other radiation
Radiopacity
  1. opacity to X-rays or other radiation
Radio-Opacity
  1. opacity to X-rays or other radiation
Resting Potential
  1. the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
  2. the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
Radiation Pressure
  1. the minute pressure exerted on a surface normal to the direction of propagation of a wave
  2. the minute pressure exerted on a surface normal to the direction of propagation of a wave