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Acceleration
Change of velocity per unit time.
Acceleration of free fall
Acceleration of an object acted on only by the force of gravity.
Accuracy
General term for how close an experimentally obtained value is to the true value.
Alpha radiation
Particles that each consist of two protons and two neutrons.
Amplitude
Maximum displacement of a vibrating particle; for a transverse wave, it is the distance from the middle to the peak of the wave.
Annihilation
The process by which a particle and its antiparticle meet, destroying each other and becoming radiation.
Antibaryon
A hadron consisting of three antiquarks.
Antimatter
General term for the type of "stuff" from which antiparticles are made.
Antimuon
Antiparticle of the muon.
Antineutrino
The antiparticle of the neutrino.
Antinode
Fixed point in a stationary wave pattern where the amplitude is a maximum.
Antiparticle
A particle's antimatter equivalent. It has identical rest mass to its corresponding particle, but if charged, equal and opposite charge.
Antiquark
Antiparticle of a quark.
Atomic number Z
The number of protons in the nucleus of an atom, and the letter which represents it.
Baryon
A hadron consisting of three quarks.