The Half-Life of a Particular Radioactive Isotope of Element X

question 62

Multiple Choice

The half-life of a particular radioactive isotope of element X is 100 years.If you know that 400 years ago a fossil contained 10 mg of this isotope,you would expect to find about _______ mg in that fossil today.

• A) 0.15
• B) 0.3
• C) 0.6
• D) 2.5
• E) 5