The Radioactive Bismuth Isotope ²¹⁰ Bi Has a Half-Life $f ( t ) = 100 ( 2 ) ^ { - \frac { t } { 5 } }$

question 11

Multiple Choice

The radioactive bismuth isotope ²¹⁰ Bi has a half-life of 5 days. If there is 100 milligrams of ²¹⁰ Bi present at t = 0, then the amount f(t) remaining after t days is given by: $f ( t ) = 100 ( 2 ) ^ { - \frac { t } { 5 } }$ How much ²¹⁰ Bi remains after 25 days?

• A) 3.125 milligrams
• B) 12.125 milligrams
• C) 5.125 milligrams
• D) 8.125 milligrams
• E) 2.125 milligrams

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