Radium being a member of the uranium series occurs in uranium ores. If the half lives of uranium and radium are respectively `4.5 xx 10^(9)` and `1620` years calculate the `(N_("radiun"))/(N_("Uranium"))` in Uranium ore at equilibrium.

The radium and uranium atoms in a sample of uranium mineral are in the ratio of 12.8xx10^(6) . If half life period of radium is 1620 years , the half life period of uranium will be

A sample of rock from moon contains equal number of atoms of uranium and lead ( t_(1//2)" for "U=4.5xx10^(9) years). The age of the rock would be :

Find the half-life of uranium, given that 3.32 xx 10^(7) g radium is found per gram of uranium in old minerals. The atomic weights of uranium and radium are 238 and 226 and half-life of radium is 1600 years (Avogadro number is 6.023 xx 10^(23)//g -"atom" ).

Find the half-life of uranium, given that 3.32 xx 10^(7) g radium is found per gram of uranium in old minerals. The atomic weights of uranium and radium are 238 and 226 and half-life of radium is 1600 years (Avogadro number is 6.023 xx 10^(23)//g -"atom" ).

The average mass of an atom of uranium is 3.9xx10^(-25) kg. Find the number of atom is 1 g of uranium.