- #1

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here is one from my book:

A zircon sample contains 4000 atoms of the radioactive element 235U. Given that 235U has a half life of 700 million years, how long would it take to decay to 125 atoms?

- Thread starter Tedwerd
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- #1

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here is one from my book:

A zircon sample contains 4000 atoms of the radioactive element 235U. Given that 235U has a half life of 700 million years, how long would it take to decay to 125 atoms?

- #2

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smells like homework

- #3

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it is simple!

Just get the formula for radioactivity..and substitute all the number that you..

tip any physics books with a topic 'radioactivity' or google 'decay law'

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