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A sample of pure radioactive isotope is left to decay. After 40.0 days, the 1 point sample is placed in a mass spectrometer, and it is determined that only 25% of the original isotope remains. How long
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25 votes
A sample of pure radioactive isotope is left to decay. After 40.0 days, the 1 point

sample is placed in a mass spectrometer, and it is determined that only
25% of the original isotope remains. How long is the half-life?

User Malcolm Anderson
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3.2k points

1 Answer

1 vote
1 vote

Answer:

6 months and 1 day

Step-by-step explanation:

User Jesse Merriman
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