Question

Potassium-argon dating can determine the age of the fossils

• A. Of about 5,00,000 years old
• B. 2 billion years old
• C. Of all ages
• D. Of azoic era only

Answer 1

The correct option is B 2 billion years old

Potassium-40, with its long half-life, is used to date fossils that are many hundreds of millions of years old.

So, the correct answer is '2 billion years old'