Strontium-90 is a radioactive material that decays according to the function A(t) = Age-0.0244t, where Ao is the initial
amount present and A is the amount present at time t (in years). Assume that a scientist has a sample of 500 grams of
strontium-90.
(a) What is the decay rate of strontium-90?
(b) How much strontium-90 is left after 40 years?
(c) When will only 300 grams of strontium-90 be left?
(d) What is the half-life of strontium-90?
(a) The decay rate of strontium-90is%.
(Type an integer or a decimal. Include the negative sign for the decay rate.)
(b) Approximately
grams of strontium-90 is left after 40 years.
(Do not round until the final answer. Then round to the nearest whole number as needed.)
(c) Only 300 grams of strontium-90 will be left in about years.
(Do not round until the final answer. Then round to the nearest tenth as needed.)
(d) The half-life of strontium-90 is approximately years.
(Do not round until the final answer. Then round to the nearest tenth as needed.)