Strontium-90 has a half-life of 28 days.(a) A sample has a mass of 50 mg initially. Find a formula  for the mass remaining after t days.(b) Find the mass remaining after 40 days.(c) What is the rate of decay after 40 days?(d) How long does it take the sample to decay to a mass  of 2 mg?(e) Sketch the graph of the mass function.

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter4: Exponential And Logarithmic Functions
Section: Chapter Questions
Problem 99E: Radioactive decay Uranium-234 has a half-life of 2.7x105 Years. (a)Find the amount remaining from a...
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Strontium-90 has a half-life of 28 days.
(a) A sample has a mass of 50 mg initially. Find a formula  for the mass remaining after t days.
(b) Find the mass remaining after 40 days.
(c) What is the rate of decay after 40 days?
(d) How long does it take the sample to decay to a mass  of 2 mg?
(e) Sketch the graph of the mass function.

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