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Ray Of Light
- a column of light (as from a beacon)
- a column of light (as from a beacon)
Rest Energy
- 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
- 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
- atmospheric discharges (lasting 10 msec) bursting from the tops of giant storm clouds in blue cones that widen as they flash upward
Red Sprites
- 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)
- 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
- a field that represents the energy lost from the radiator to space
- a field that represents the energy lost from the radiator to space
Radiopacities
- opacity to X-rays or other radiation
Radiopacity
- opacity to X-rays or other radiation
Radio-Opacity
- opacity to X-rays or other radiation
Resting Potential
- the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
- the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
Radiation Pressure
- the minute pressure exerted on a surface normal to the direction of propagation of a wave
- the minute pressure exerted on a surface normal to the direction of propagation of a wave