Question

A radioactive substance has a half life of 35 days. Calculate the number of days required for a half life to be 12.5%​

Answer 1

Answer:  100%-------50%--------25%-------12.5%

for the substance to become 12.5% of the initial value, it takes 3 half lives

so the number of days required= 3* half life

                                                    =3*35 days= 105 days

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Answer 2

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