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Astronomy, age of a moon rock, half life

 
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Mar11-11, 12:03 AM   #1
 

Astronomy, age of a moon rock, half life

Moon rocks containing uranium 238, decays to lead with a half life of 4.5 billion yrs. The lunar rock sample you're invistigating contains half of the original uranium 238. How old is the rock?

How would I go about solving this? What formula should I use?
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Mar11-11, 12:56 AM   #2
 
What is a half-life? What does half-life mean?
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