When a radioactive isotope is set up close to a counter, a count rate of 38 000 counts / s is obtained. The table shows the count rate from the isotope over a three-year period.
What is the half-life of the isotope?
1 )
less than 1 year
more than 1 year but less than 2 years
3 )
more than 2 years but less than 3 years
4 )
more than 3 years
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