Question

after 65 minutes, the amount of a particular radioisotope remaining is 3.13% of the initial amount. what is the half life of the radioisotope?

Answer 1

13 mins

Step-by-step explanation:

We need to find how many half lives are required to reach .0313

.0313 = 1/2^n log both sides and solve for n

log.0313 / log (1/2 ) = n where n= NUMBER of halflives

n = ~ 5 half lives

these 5 half lives took up 65 minutes

so EACH half life is 65/5 = 13 mins