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The half-life of a radioactive isotope is 140 days. In how many days does the decay rate of a sample of this isotope decrease to one-fourth of its initial decay rate?

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Nuclear physics is a field of physics that studies the structure of atomic nuclei, their interactions, and their constituents. It also studies other forms of nuclear matter.


The half-life of a radioactive isotope is 140 days. In how many days does the decay rate of a sample of this isotope decrease to one-fourth of its initial decay rate?






 
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