6.25 gram of element x would be left after 4 years.
What's half life of an element?
- Half - life is the time period of decay of an element to half of its initial number of nuclei.
- After n no. of half lives, no. of nuclei left in the sample is initial number of nuclei / 2^n
What's the amount of 100 gm of element x left after 4 half lives ?
Leftover amount of the element x = 100/2^4
= 100/16 = 6.25 gram
Thus, we can conclude that 6.25 gram of element x would be left after 4 years.
Learn more about the half life here:
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