Chemistry

Problem

A radioisotope has a half-life of

12\,\text{h}

. How much time will elapse before only

40\%

of the original nuclei remain? (Give your answer in days and hours, rounded to the nearest hour.) a)

0\,\text{d}\;12\,\text{h}

0\,\text{d}\;16\,\text{h}

0\,\text{d}\;9\,\text{h}

0\,\text{d}\;14\,\text{h}