In the Formula A(t) $\mathrm { A } ( \mathrm { t } ) = \mathrm { A } _ { 0 } \mathrm { e } ^ { k t }$

question 185

Multiple Choice

In the formula A(t) $\mathrm { A } ( \mathrm { t } ) = \mathrm { A } _ { 0 } \mathrm { e } ^ { k t }$ , A is the amount of radioactive material remaining from an initial amount $\mathrm{A}_{0}$ at a given time t, and k is a negative constant determined by the nature of the material. A certain radioactive isotope
Decays at a rate of 0.125% annually. Determine the half-life of this isotope, to the nearest year.

• A) 400 years
• B) 241 years
• C) 6 years
• D) 555 years

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