6 Answered Questions for the topic Half Life

Half Life Calculus 2

09/12/18

#### If 20% of the substance disappears in 10 years, what is its half-life? (Round your answer to two

A radioactive substance follows the decay equation dA/ dt= kA. If 20% of the substance disappears in 10 years, what is its half-life? (Round your answer to two decimal places.)

04/29/18

#### A fossilized leaf contains 13% of its normal amount of carbon 14. How old is the fossil (to the nearest year)? Use 5600 years as the half-life of carbon 14

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04/28/18

#### Half life algebra equation

The model for radioactive decay is y=y0e^−kt. A radioactive substance has a half-life of 820 years. If 70 grams are present today, in how many years will 28 grams be present? While solving this...
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Half Life

04/23/18

#### Find the half-life. (Round your answer to the nearest whole number.)

A breeder reactor converts uranium-238 into an isotope of plutonium-239 at a rate proportional to the amount of uranium-238 present at any time. After 10 years, 0.03% of the radioactivity has...
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11/13/17

#### Please help with this word problem?

A radioactive isotope, iron-52, used in the creation of medical images of bone marrow, has a half-life of 8.2 hours. If 8 microcuries are given to a patient, how many microcuries are left after 12...
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Half Life

11/12/17

#### The half-life is 5600 years. If a piece shows only 79% left, when did the tree die?

Dealing with half life problems of carbon materials.

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