​Strontium-90 is a radioactive material that decays according to the function A(t)=A0e−0.0244t, where A0 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?

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Writing and Balancing Nuclear Equations

A nuclear equation is a symbolic representation of a nuclear reaction using certain symbols. It is studied in nuclear chemistry and nuclear physics.