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5) The half life of a radioactive isotope is 8 days. If 3.6 kg are present now, how much will be present in t days? How much will be present in 22 days?
closed with the note: no longer needed.
asked Sep 13, 2014 in PRECALCULUS by secretslocked Rookie
closed Sep 14, 2014 by secretslocked

1 Answer

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The half life of a radioactive isotope is 8 days.

Apply the formula image.

Find k  first.

image

image

image

Apply ln each side.

image

image

image

image

Subbstitute k in image.

image

image

image kg will be present in t  days.

 

Subbstitute 22 days for t  in image.

image

image

0. 535 kg will be present in 22 days.

 

answered Sep 13, 2014 by david Expert
edited Sep 13, 2014 by bradely

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