Mass spectrometic analysis of potassium and argon atoms in a Moon rock sample shows that the ratio of the number of (stable)`.^(40)`At atoms present to the number of (radioactive)`.^(40)K` atoms is `10.3`.Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of `1.25 xx 10^(9) yr`. How old is the rock ?

In a Moon rock sample the ratio of number of (stable) ""^(40)Ar atoms present to the number of (radioactive) ""^(40)K atoms is 10.3. Assume that all the argon atoms were produced by the decay of potassium atoms, with a half life of 1.25xx10^(9)y . How old is the rock?

Analysis of potassium and argon atoms in a moon rock sample by a mass spectrometer shows that the ratio of the number of stable Ar^(40) atoms present to the number of radioactive K^(40) atoms is 7 : 1 . Assume that all the argon were produced by the decay of potassium atoms, with a half-life of 1.25 xx 10^(9) year. How old is the rock?

In moon rock sample the ratio of the number of stable argon- 40 atoms present to the number of radioactive potassium -40 atoms is 7:1 . Assume that all the argon atoms were produced by the decay of potassium atoms, with a half-life of 2.5xx10^(9)yr . The age of the rock is

The total number of nucleons in the atoms of clacium and argon is 40 and the atomic numbers of calcium neutrons present in the nucleus of argon atom.

.^(238)U decays with a half-life of 4.5 xx10^(9) years, the decay series eventually ending at .^(206)Pb , which is stable. A rock sample analysis shows that the ratio of the number of atoms of .^(206)Pb to .^(238)U is 0.0058. Assuming that all the .^(206)Pb is produced by the decay of .^(238)U and that all other half-lives on the chain are negligible, the age of the rock sample is (ln 1.0058 =5.78 xx10^(-3)) .

.^(238)U decays with a half-life of 4.5 xx10^(9) years, the decay series eventaully ending at .^(206)Pb , which is stable. A rock sample analysis shows that the ratio of the number of atoms of .^(206)Pb to .^(238)U is 0.0058. Assuming that all the .^(206)Pb is prodduced by the decay of .^(238)U and that all other half-lives on the chain are negligilbe, the age of the rock sample is (1n 1.0058 =5.78 xx10^(-3)) .

In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at an instant of time equal to its mean life is

In a radioactive disintegration, the ratio of initial number of atoms to the number of atoms present at an instant of time equal to its mean life is

The number of 238 U atoms in an ancient rock equals the number of 206 Pb atoms. The half-life of decay of 238 U is 4.5x10 9 years. Estimate the age of the rock assuming that all the 206 Pb atoms are formed from the decay of 238 U.