Question

The amount of a sample remaining after t days is given by the equation mc001-1.jpg, where A is the initial amount of the sample and h is the half-life, in days, of the substance. A scientist has a 10-mg sample of a radioactive isotope. The isotope has a half-life of 8 days. After 16 days, how much of the radioactive isotope remains? 2.0 mg 2.5 mg 5.7 mg 7.1 mg

Answer 1

Answer:

b. 2.5 mg

just took the test on edge

Answer 2

P(t)= A(1/2)^(t/h)

P(t)=10(1/2)^(16/8)

(1/2)^(16/8) =.25

P(t)=10(.25)

P(t)=2.5

Therefore the answer is B. 2.5mg.