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?
How much of a sample of radioisotope remains after one half-life after two half-lives
After a single half life period, half the mass of
the sample decay, if we have 20g of the sample , after the half we will half
10g, after two half- lives we will have 5g. Andafter 3 half lives we will have 2.5g.
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