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?
what happened when potassium-40 decays to argon-40 with a half-life of 1.27×109 yr.
whenpotassium decays into argon-40, a beta decays
has occurred, in a beta decay the atomic number increases by one and the mass
number remain unchanged
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