Question

Which of the following statements about Carbon-14 is true? 1) Carbon-14 is a radioactive isotope of Carbon 2) The proportion of Carbon-14 in an organism remains constant throughout its lifespan 3) Radioactive materials steadily decay with a known half-life

Answer 1

1) Carbon-14 is a radioactive isotope of Carbon

Step-by-step explanation:

Carbon-14 is indeed a radioactive isotope of Carbon. It is created in the upper atmosphere by cosmic ray bombardment and is present in trace amounts in the Earth's atmosphere. It is used in radiocarbon dating to determine the age of organic materials.