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, A Level Physics Key
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, Hypothesis A testable prediction, often implied by a theory
Theory A hypothesis that has been tested with a significant amount of data
Test A way to gather a set of results
Absolute Refractive Index the ratio of the speed of light in a vacuum compared with the speed of light in a
medium
Absolute Uncertainty The uncertainty in a measurement expressed in the unit you are measuring in
Absorption (fibre optics) Where some of the energy of a fibre-optic is absorbed by the material of the fibre
optic
Acceleration The rate at which velocity changes
Accurate Result A result that is very close to the true answer
Alpha Decay Decay where an unstable atom releases an alpha particle
Alpha Particle particle emitted by a radioactive source that contains two protons and two neutrons
Ammeter A device used to measure current in a circuit
Amplitude For a wave or vibration, the maximum displacement on either side of the equilibrium
(midpoint) position.