The given sample will take 12.32 years to decay to 78 % of the original amount.
What is Half Life period ?
Half-life is the time required for a quantity to reduce to half of its initial value.
The term is commonly used in chemistry to describe how quickly unstable atoms undergo radioactive decay or how long stable atoms survive.
Total life = 28 x 2 = 56 years
Sample consumed = 100% -78% = 22%
Therefore,
Duration totdecay to 78% = 56 x 22/100 = 12.32 years.
Thus, The given sample will take 12.32 years to decay to 78 % of the original amount.
Learn more about Half Life period here ;
https://brainly.com/question/24710827
#SPJ2
