Physics R

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Radioactive dating
The use of a radioactive substance to give information about the age of an object.
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Radio wave
Longest wavelength of the electromagnetic spectrum.
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Range of vision
Distance from the near point of an eye to its far point.
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Rarefraction
Stretched apart.
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Real image
An image formed where light rays meet.
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Red giant
A star that has expanded and cooled, resulting in it becoming red and much larger and cooler than it was before it expanded.
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Red-shift
Increase in the wavelength of electromagnetic waves emitted by a star or galaxy due to its motion away from us. The faster the speed of the star or galaxy, the greater the red-shift is.
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Reflector
A surface that reflects radiation.
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Refraction
The change of direction of a light ray when it passes across a boundary between two transparent substances (including air).
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Refractive index
Refractive index, n, of a transparent substance is a measure of how much the substance can refract a light ray.
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Renewable energy
Energy from sources that never run out including wind energy, wave energy, tidal energy, hydroelectricity, solar energy and geothermal energy.
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Repel
To cause to move apart.
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Residual current circuit breaker (RCCB)
A RCCB cuts off the current in the live wire when it is different from the current in the neutral wire.
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Resistance
Resistance (in ohms (Ω)) = potential difference (in V) ÷ current (in amperes (A)).
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Resultant force
The combined effect of the forces acting on an object.
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Resultant moment
The difference between the sum of the clockwise moments and the anticlockwise moments about the same point if they are not equal.
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Other cards in this set

Card 2

Front

Radio wave

Back

Longest wavelength of the electromagnetic spectrum.

Card 3

Front

Range of vision

Back

Preview of the front of card 3

Card 4

Front

Rarefraction

Back

Preview of the front of card 4

Card 5

Front

Real image

Back

Preview of the front of card 5
View more cards

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