The half-life of a radioactive isotope is 140 d. How many days would it take for the decay rate of a sample of this isotope to fall to one-fourth of its initial value?
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![The half-life of a radioactive isotope is 140 d. How many days
would it take for the decay rate of a sample of this isotope to fall to
one-fourth of its initial value?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F31675018-c84d-4ab3-93d1-8e8602fe95b4%2Fb24c30b5-cd6b-4e54-8c29-342b2578d8d8%2F3to355r_processed.jpeg&w=3840&q=75)
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