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In one common type of household smoke detector, the radioactive isotope americium-241 decays by alpha emission. The alpha particles produce a small electrical current because they are charged. If smoke enters the detector, it blocks the alpha particles, which reduces the current and causes the alarm to go off. The half-life of 241Am is 433 y, and its atomic weight is 241 g/mol. Typical decay rates in smoke detectors are 690 Bq
1) Write the decay reaction of 241Am and identify the daughter nucleus.
241Am→α+237Np
241Am→α+237Bk
241Am→α+239Pa
241Am→α+239Es
241Am→α+241Cm
2) By how much does the alpha particle current decrease in 1.0 y due to the decay of the americium? (Express your answer to two significant figures.)
3)By how much does the alpha particle current decrease in 40 y due to the decay of the americium? (Express your answer to two significant figures.)
4)How many grams of 241241Am are there in a typical smoke detector? (Express your answer to two significant figures.)(×10-9 g )
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