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?
After 4797 y,how much of an original 0.250g sample of radium -226 remains?,
solution
radium-226 has
a half life period of 1600 years, in 4797 years we have 4797/1600 number of
half lives , which is 2.9981 half lives, which is almost 3 half lives only
12.5% will remain.
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