Suppose the grand unified theory (GUT) was correct and the half-life of a proton was 1.2Af-1035y.
Part A. Estimate the decay rate of a liter of water in decays per second. Express your answer using two significant figures.
Part B. Estimate the decay rate of a liter of water in curies.
Part C. How does this compare to a small (by laboratory standards) radioactive source of one microcurie?