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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nitrogen 13 has a half life of 10 minutes how much of a 16 mg sample would remain after 40 minutes
after
40 minutes , 4 half lives must have elapse, after four half lives only 6.25%
will remain, therefore only 1mg of the original sample will remain,
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