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1.9.12 Product rule (A-level only)

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Question 19

A scientist models the activity, AAA MBq, of a radioactive isotope over time, ttt days, using the equation

A=(15t+2)e−0.4t,t≥0 A = (15t + 2)e^{-0.4t}, \quad t \ge 0 A=(15t+2)e−0.4t,t≥0

Find, using calculus, the exact value of ttt for which the activity is stationary.

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1.9.12 Product rule (A-level only) Questions

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