Radium `Ra^236` has a half-life of 1590 years. How much of the original amount of `Ra^236` would remain after 6360 year ?

A radioisotope has half life of 10 years. What percentage of the original amount of it would you expect to remain after 20 years?

A radioisotope has half life of 10 years. What percentage of the original amount of it would you expect to remain after 20 years?

The half life of Ra is 1600 years. The fraction of a sample of Ra that would remain after 6400 years is

The half life of Ra is 1600 years. The fraction of a sample of Ra that would remain after 6400 years is

A radioactive substance has a half-life of 1 year. The fraction of this material, that would remain after 5 years will be.

Tritium has a half-life of 12.5 years. What fraction of the sample will remain undecayed after 50 years?

A radioactive isotope Cs^(137) has a half life period of 30 years. Starting with 1 mg of Cs^(137) how much would remain after 120 years?

A radioactive isotope Cs^(137) has a half life period of 30 years. Starting with 1 mg of Cs^(137) how much would remain after 120 years?

The half-life period of radium is 1600 years. The fraction of a sample of radium that would remain after 6400 years is.