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. (a) Write the alpha decay reaction of 241Am and identify the daughter nucleus. (b) By how much does the alpha particle current decrease in 1.0 y due to the decay of the americium? How much in 50 y? (c) How many grams of 241Am are there in a typical smoke detector?