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Problem

Differential Equations for Engineers

Counting Half-Lives of Iodine-131

A sample of the radioisotope iodine-131 has an initial mass of 48.0 mg, and its half-life is 8.02 days. Let $m(t)$ be the mass remaining, in milligrams, after $t$ days.

Find $m(t)$ , and determine the first time $t_d$ at which the remaining mass is 3.00 mg.

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m(t)

t_d

(days)

Type / for a fraction, ^ for a power, sqrt for a root, pi for π.

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