Question 1. The half-life of carbon-14 is 5730 years. A fossil that is 22920year

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Question 1.
The half-life of carbon-14 is 5730 years. A fossil that is 22920years old would have what amount of the normal portion of C-14 toC-12? Question 2. The half-life of potassium-40 is 1.3billion years. If a rockspecimen contained 12 milligrams of potassium-40 when it was formedand now contained 3milligrams of potassium-40, How old is therock? Question 1.
The half-life of carbon-14 is 5730 years. A fossil that is 22920years old would have what amount of the normal portion of C-14 toC-12? Question 2. The half-life of potassium-40 is 1.3billion years. If a rockspecimen contained 12 milligrams of potassium-40 when it was formedand now contained 3milligrams of potassium-40, How old is therock?

Explanation / Answer

Half-life of C14 = 5730 yrs now          C14=22920 yrs normal portion C14 -C12 =? 1 - 1/2    = 5730yrs 1/2 - 1/4 = 5730 yrs 1/4 - 1/8 = 5730 1/8 -1/16 =5730                  22920 yrs total portion is 4.                  22920 yrs total portion is 4.

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