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Question #18b2d

1 Answer

May 9, 2017

12.6 days.

Explanation:

#sf(N_t=N_0e^(-lambdat))#

#sf(lambda=0.693/t_(1/2)=0.693/3.8=0.1823color(white)(x)"d"^(-1))#

#sf(0.1=e^(-lambdat))#

#:.##sf(ln(0.1)=-lambdat)#

#sf(t=-(-2.302/0.1823)=12.6color(white)(x)d)#

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