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?
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after three half-lives, what fraction of the original radioactive isotope remains in a sample?
after three half lives only 12.5% of the original sample will remain
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