Americium-241 is a radioactive substance used in smoke detectors. The half life of americium is 432 years. If a smoke detector initially contains 1 gram of Americium 241, how much will remain in 432 years? A) 0.5g B) 1.0g C) 1.5g D) 2.0g
The half life of americium is 432 years. That means that after 432 years only half(1/2) of initial amount will be left. If we had 1 g, then after 432 years we will have only half of it. 1g*1/2=1/2 g=0.5 g Answer is A) 0.5g
