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  4. A radioactive element has half-life period 1600 years. After 6400 years what amount will remain ?

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Q. A radioactive element has half-life period 1600 years. After 6400 years what amount will remain ?

Atoms

Solution:

6400 years = 4 half life periods. So, amount of element left = $\frac{1}{2^4} = \frac{1}{16}$ th part.