Level 2

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acceleration
change of velocity per time
acceleration of free fall
acceleration of an object acted on only by the force of gravity
alpha radiation
radiation that 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
when a particle and its antiparticle meet, they destroy each other and become radiation
antibaryon
a hadron consisting of three antiquarks
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
there is an antiparticle for every type of particle. They have an equal rest mass and equal and opposite charge
antiquark
antiparticle of a quark
atomic number (Z)
the number of protons in the nucleus of an atom