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1.3 Exponential Functions. Exponential Function. Rules for Exponents. Half-life.
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Half-life Exponential functions can also model phenomena that produce decrease over time, such as happens with radioactive decay. The half-life of a radioactive substance is the amount of time it takes for half of the substance to change from its original radioactive state to a non-radioactive state by emitting energy in the form of radiation.
Ex: The half-life of a certain radioactive substance is 14 days. There are 6.6 g present initially.A. Express the amount of substance remaining as a function of time t.B. When will there be 1g remaining?