How many half life's are there in a 100 year span?

How many half life's are there in a 100 year span?
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Answer :

A half life is the time for one half of a radioactive materialto decay. Different materials have half-lives of different lengths.Some last only a fraction of a second. Some have a half life ofhundreds of thousands of years. Unless you tell us what thematerial is, we can only answer "that all depends."
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