Question

The decay rate (k) is 2.2% per year = -0.022

The half life is ___ years.

Answer 1

31.5 years.

Explanation:

Half life is given by
`= -(ln(2))/(k)`. Where we use the natural logarithm. Plugging in a value of
`k = -0.022` we get: 31.5 years for the half life.