Americium-241 is an alpha-emitting isotope with a half-life of 432 years which is commonly used in smoke detectors. Calculate the fraction of americium-241 that will be remaining in a Smoke detector 1,296 years after its production IF YOU ANSWER THIS QUESTION YOU GET 15 POINTS PLEASE HELP ME IM BAD AT PHYSICS

Large electric fields in cell membranes cause ions to move through the cell wall. the field strength in a typical membrane is 1.0 x 10 7 n/c. what is the magnitude of the force on a calcium ion with charge +e? what is its acceleration? is it possible for a particle with the same charge as as calcium to have a different acceleration if placed at this location? what would change the acceleration: mass of the particle? diameter of the particle?