what do you think you know about physics, physics is the study of matter under the effect of energy, but does this includes solid states bodies, atoms at ground states, object at microscopic size or object moving faster than light? these and more is what prompt me to ask again what is physics?
which naturally-occurring radioactive particles are the size of a helium nucleus?
the alpha particle is the only radioactive particle with same size as the
helium nucleus or helium ion, the alpha particle has a charge of +2 and a mass
of 4.it Has a symbol of 42He.
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