question: 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
choices.text: less useful isotope? more useful isotope
choices.label: A B
para: Because these isotopes decay more slowly, they can be used to date much older specimens.
para_anno.effect_prop: utility in dating older specimens
para_anno.cause_dir_str: more slowly
para_anno.effect_dir_str: older
para_anno.cause_dir_sign: LESS
para_anno.effect_dir_sign: MORE
para_anno.cause_prop: rates of isotope decay
question_anno.more_effect_dir: more useful
question_anno.less_effect_dir: less useful
question_anno.less_cause_prop: Carbon 14
question_anno.more_effect_prop: isotope
question_anno.less_effect_prop: isotope
question_anno.less_cause_dir: isotope