Open Question: I need help with an example question on radioactivity!?

29 July 2010, 10:11 pm

a radiometric dating technique uses the decay of U-238 to Pb-206( the half-life for this process is 4.5 billion years) to determine the age of the oldest rocks on Earth and by implication the age of earth itself. The oldest uranium -containing rocks on Earth contain approximately equal numbers of uranium atoms and lead atoms. Assuming the rocks were pure uranium when they were formed, how old are the rocks? Word problems to me is like kryptonite to superman! They throw me off every time.... Read More »

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