M Prep | MCAT 2015 Question of the Day - Prep, Practice Questions, and More!

Q:

A particular organism well preserved in ice has been found to contain 1 mg of a radioactive isotope X. Lifeforms usually contain around 40 mg of this isotope. The half-life of X is around 20,000 years. For the organism with 1 mg of the isotope, scientists believe it died 100,000 years ago. Their prediction was

A

~100,000 years too low

B

~50,000 years too high

C

Relatively accurate

D

Unconfirmed