Question

The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours. Q(t) = 67e^-0.001199t (b) How much will remain after 85 hours? (Round your answer to one decimal place.) 60.5 mg (c) When will the initial mass decay to 13 milligrams? (Round your answer to one decimal place.) hr

          The radioactive isotope thorium 234 has a half-life of approximately 578 hours.
(a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours.
Q(t) = 67e^-0.001199t
(b) How much will remain after 85 hours? (Round your answer to one decimal place.)
60.5 mg
(c) When will the initial mass decay to 13 milligrams? (Round your answer to one decimal place.)
hr

The radioactive isotope thorium 234 has a half-life of approximately 578 hours.
(a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours.
Q(t) = 67e^-0.001199t
(b) How much will remain after 85 hours? (Round your answer to one decimal place.)
60.5 mg
(c) When will the initial mass decay to 13 milligrams? (Round your answer to one decimal place.)
hr

Added by Joseph B.

Precalculus with Limits

Ron Larson 2nd Edition

Instant Answer

Solved by Expert Julie Silva

04/12/2022

Step 1

001199t): \[13 = 67e^{-0.001199t}\] ** Show more…

Show all steps

Thanks for your feedback!

The radioactive isotope thorium 234 has a half-life of approximately 578 hours. (a) If a sample has a mass of 67 milligrams, find an expression for the mass after t hours. Q(t) = 67e^-0.001199t (b) How much will remain after 85 hours? (Round your answer to one decimal place.) 60.5 mg (c) When will the initial mass decay to 13 milligrams? (Round your answer to one decimal place.) hr