Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 37.0 % of an Am-241 sample to decay? Express your answer with the appropriate units
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Americium-241 is used in some smoke detectors. It is an alpha emitter with a half-life of 432 years. How long will it take in years for 34.0% of an Am-241 sample to decay? Express your answer numerically in years.
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Smoke Detectors The radioactive isotope $_{95}^{241} \mathrm{Am},$ with a half-life of 432 y, is the active element in many smoke detectors. Suppose such a detector will no longer function if the activity of the $_{24}^{95} \mathrm{Am}$ it contains drops below $\frac{1}{512}$ of its initial activity. For what length of time will this smoke detector work?
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