Question

Radiometric dating is often used to calculate the ages of rocks. Explain the principles of radiometric dating using the words “parent”, “daughter products” and “half-life”. Also Uranium-235 has a half-life of 700 million years. What fraction of the original amount of parent material will remain after 2.1 billion years?

Answer 1

In radiometric dating parent Isotope is the Isotope which when decays to form a daughter isotopes. For example Ur decays to Pb to Parent I daughtes Isotope Isotope Half life a It is the time required for half of the sample undergo radioactive decay. Means it is the time which half of parent isotope changes to daughtey half amount Half life of 2350 700 million years. After 2.1 billion years two of helf life will be 3. 2100 million years = 3. 75D m (joy you Now it we hall 100% parent Isotope. After I helf life it will decays 50% Aftee 2 helf lifes 25% ( half of 50%). After 3 helf life → 12.5% •1{ + 1 to Answay is After 211 billion yeay 12.5% of original parent Isotopes will remain.