Uranium-238 (U-238) has a​ half-life of 4.5 billion years. Geologists find a rock containing a mixture of​ U-238 and​ lead, and determine that 82​% of the original​ U-238 remains; the other 18​% has decayed into lead. How old is the​ rock? a.) The rock is _______ billion years old.

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Half Life

The concept of Half Life has numerous practical applications some of them includes figuring out the effective drug dosage to finding out when a radioactive becomes safe to use. If you look for a career in Nuclear Physics you will need this concept.