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1. The Half life of a waste material is 6 months.

Show that the activity will decrease about 1000 in 5 years.
2. (Original post by joyoustele)
The Half life of a waste material is 6 months.

Show that the activity will decrease about 10000 in 5 years.

Are you sure 10,000 is the correct answer?
3. (Original post by uberteknik)
Are you sure 10,000 is the correct answer?
sorry, it's 1,000
4. (Original post by joyoustele)
sorry, it's 1,000
OK.

You can use the relationship:

and

where

5. (Original post by uberteknik)
OK.

You can use the relationship:

and

where

Thanks, i managed to do it
6. (Original post by joyoustele)
Thanks, i managed to do it
You don't need to convert to seconds since it's the ratio of the times that are needed, just keep the time units the same. i.e. 6 months and 60 months (5 years).
7. (Original post by uberteknik)
You don't need to convert to seconds since it's the ratio of the times that are needed, just keep the time units the same. i.e. 6 months and 60 months (5 years).
oh. Okay. Thank you very much

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