40. explain how radioactive decay works for measuring the absolute age of ancient objects. 41. why is…

Brief Explanations:

Radioactive decay is a natural process where unstable atomic nuclei lose energy by emitting radiation. For measuring the absolute age of ancient objects, scientists use the fact that radioactive isotopes decay at a known, constant rate (half - life). By measuring the ratio of parent isotope to daughter isotope in a sample, the age can be calculated. It's a good method for ancient fossils because the decay process is not affected by external factors like temperature or pressure, and the half - lives of some isotopes are long enough to date very old materials.

Answer:

Radioactive decay works by using the known, constant decay rate (half - life) of radioactive isotopes. Scientists measure the ratio of parent to daughter isotopes in a sample to calculate its age. It is a good method for ancient fossils as the decay is not affected by external factors and some isotopes have long half - lives suitable for dating old materials.