Question

suppose a radioactive isotope has a half- life of 82 years. If we currently have 80kg, how much will be left after 25 years?

Answer 1

that's chemistry, hmm.

is it a first level? second level?

Answer 2

it second level
If you could help me with it thank you very much
cause i'm stuck

Answer 3

halflife of 82 years, means after \[n \cdot 82\; \text{years}\] there is only an the \[2^n\]'th part left. So after x years there is \[\frac{80\text{kg} }{2^{x/82\;\text{years}}}\] left.

Answer 4

thank you my teacher told me to put it into the "pert" formula that's why i got confused
could you help me put it into "pert" formula???? thanks

Answer 5

Sorry, I never heard of such a thing.

Answer 6

it's okay thank you