Read the passage below and choose the right answer to the following question (choices are less useful isotope? or more useful isotope ): Because these isotopes decay more slowly, they can be used to date much older specimens. For dating the age of a fossil, and compared to the isotope Francium with a 22 minute half-life, would Carbon 14 with its 5730 year half-life be a less useful isotope? or more useful isotope?
more useful isotope