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anonymous
 one year ago
A 29 gram sample of a substance thats used for drug research has a kvalue of 0.1359.
N=Noe^kt
No=initial mass( at time t=0)
N=mass at time t
k=a positive constant that depends on the substance itself and on the units used to measure time
t=time, in days
Find the substance's halflife,in days.Round your answer to the nearest tenth.
anonymous
 one year ago
A 29 gram sample of a substance thats used for drug research has a kvalue of 0.1359. N=Noe^kt No=initial mass( at time t=0) N=mass at time t k=a positive constant that depends on the substance itself and on the units used to measure time t=time, in days Find the substance's halflife,in days.Round your answer to the nearest tenth.

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amoodarya
 one year ago
Best ResponseYou've already chosen the best response.0\[n=n_0 e^{0.1359t}\\n=0 \rightarrow n_0=n_0 e^0=29 gr\\n_0=29\\n=29* e^{0.1359t}\]

amoodarya
 one year ago
Best ResponseYou've already chosen the best response.0for a half life solve n=n0/2 \[n=29* e^{0.1359t}=\frac{n_0}{2}=\frac{29}{2}\\ e^{0.1359t}=\frac{1}{2}\\ln\\ln( e^{0.1359t})=\ln(\frac{1}{2})\\0.1359t=0.6931\\t=5.100\]
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