Calculating Continuous Decay

[wendy218]

Radon-222 decays at a continuous rate of 17.3% per day. How much of 200 mg of radon-222 will remain after one year?

_____mg of radon-222 will remain in one year. .
Round your answer to three decimal places.

i used a(t)=ae^rt
which gives me 200e^-0.173(365) however that did give me the correct answer mobius was looking for ..

 

[stapel]

Radon-222 decays at a continuous rate of 17.3% per day. How much of 200 mg of radon-222 will remain after one year?

_____mg of radon-222 will remain in one year. .
Round your answer to three decimal places.

i used a(t)=ae^rt
which gives me 200e^-0.173(365) however that did give me the correct answer mobius was looking for ..

Are you saying that you got the correct answer? What is your question? (And who is "mobius"?)

 

[Dr.Peterson]

Radon-222 decays at a continuous rate of 17.3% per day. How much of 200 mg of radon-222 will remain after one year?

_____mg of radon-222 will remain in one year. .
Round your answer to three decimal places.

i used a(t)=ae^rt
which gives me 200e^-0.173(365) however that did give me the correct answer mobius was looking for ..

I suppose you mean it did not give you the answer that your software, evidently called "Mobius", expects.

What number did you get? And did you pay attention to parentheses (which are not all there in what you wrote)?

I suspect there is also an error in the problem, because to three decimal places, the answer you get should be 0.