A sample of uranium-235 is to be studied. How long will it take for the sample to reach 65% of its initial value?
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- The original number of atoms in a sample of a radioactive element is 4.00x10-0 . Find the time it takes to decay to 1.00x104 atoms if the half-life was 14.7 years? O 147 years O 29.4 years O 78.2 years O 58.8 yearsA radioactive sample is studied for 100 days. It was found that after the given period the radioactive sample reduced to 83 % of the initial amount. From the given data estimate the half-life of the sample.A sample of radioactive material has a half-life of 12 hours. If the initial sample contained 6.2x10¹3 radioactive nuclides estimate the number of radioactive nuclides present in the sample after 5 hours.
- A sample of plutonium-239 has a mass of 24.0 mg. If after 72300 years 6.00mg are left, what is the half life of this isotope?A radioactive sample took 10 years to reach 25% of its initial amount. Estimate the half life of the material.The number of radioactive nuclei present at the start of an experiment is 4.80 × 10¹5. The number present twenty days later is 6.34 × 10¹4. What is the half-life (in days) of the nuclei? Number i Units