A radioactive sample has a decay constant of 49.15x10-12 s¹. Estimate the half-life.
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- If it is known that 87% of an initial radioactive sample remains after 3 days, what is the decay rate λ of the sample in units of decays/day?The half-life of beryllium-7 is about 53.3 days. (a) Determine the decay constant for beryllium-7. (b) What percentage of a sample remains undecayed after two weeks (1.21 ✕ 106 s)?The amount of carbon-14 found in a fossil of a tree is around 0.05% when compared to fresh wood of the same kind. Estimate the age of the fossil.
- 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?Does the number of radioactive nuclei in a sample decrease to exactly half its original value in one half-life? Explain in terms of the statistical nature of radioactive decay.Iodine-131 is used in the form of sodium iodide to trwat cancer of the thyroid. The isotope has a half life of 8.04 days. If you begin with 25.0-mg of radioactive 131I, what mass remains after 32.2 days?