Carbon 14, with a half-life of 5700 years, is used to estimate the age of organic materials. What fraction of the original amount ofcarbon 14 would an object have if it were 2000 years old?

Carbon-14 has a half-life of 5730 years. What mass of carbon-14 would have a decay rate of 20,000 Bq? Considering that carbon-14 decays via beta-minus radiation, ALSO write the complete nuclear decay equation.

Technetium-99 (half-life = 6.0 h) is used in medical imaging. How many half-life's would go by in 34 h?

A scientist discovers a new isotope, exponentialitium. The scientist sets aside 150 grams of exponentialitium. After 3 years, the scientist notices there is only 135 grams of exponentialitium left.  What is the half-life of this new isotope? Round your answer to four decimal places.

The half-life of a radioactive isotope is 6.02 hours.  25.0 Grams of this isotope is needed for an experiment.  How many grams of the isotope must be ordered if 48 hours pass between the time the isotope is ordered and the start of the experiment?

the half life of a radioactive element is 29.2 vears, how many years will it take for a sample to decay to the point where its activity is 76.8% of the original value?

A 500 g of radioactive sample has a half life of 2.5 years. How much of the initial sample will be left after 1.4 years.