Measurements of a certain isotope tell you that the decay rate decreases from 8337 decays/minute to 3174 decays/minute over a period of 5.00 days.
then T1/2 = ln(2)/lamda
The Attempt at a Solution
I converted all the units..
t = 5 days = 432000 seconds
R = 8337 decays/minute = 52.9 decays/s
Ro=3174 decays/minute = 138.95 decays/s
52.9=138.95 . e^-lamda*432000
lamda = -1.86*10^-6
I am confused.. the lamda should not be a negative number right?
because half-life should be a positive number..
please help me..
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