40. Determine the amount of time for polonium-210 to decay to one fourth its original quantity. The
half-life of polonium-210 is 138 days. Please show all work. (ref: p.808-813)
in order to decay to half, it will be 138 days. in order to half that again down to a quarter, it will be another 138 days. 138+138 is 276, thus, 276 days.
