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Presentation on theme: "[http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-02d.JPG]"— Presentation transcript:

1 [http://wps.prenhall.com/wps/media/objects/476/488316/Instructor_Resources/Chapter_17/FG17_04-02d.JPG]

2 Half-Life Time it takes half of the atoms in a radioactive sample to decay into other atoms. [http://wps.prenhall.com/wps/media/objects/602/616516/Media_Assets/Chapter22/Text_Images/FG22_02.JPG] Click Here for Half-Life Demo

3 [http://www.compumike.com/science/halflifeu238.gif] [http://regentsprep.org/Regents/earthsci/graphics/raddecay2.jpg]

4 Half-Life The length of a half-life is related to how active the elements are. (This is measured in curies) IsotopeActivity (Curies) U Am Cs I ,500

5

6 Half-Life Problem: If I has a half-life of 8.04 days, how long will it take until only 25% of it is left?

7 Half-Life 2 half-lives = days

8 Half-Life Problem: If a fossil only has 12.5% of 14 6 C remaining, how old is it? 5730 x 3 = years

9 Half-Life Problem: If you start with 25 grams of Xe, which has a half-life of 5.25 days, how much will be left after days?

10 Half-Life Click Here for Radioactive Dating Game


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