5. Using the k value and any x,y pair,
calculate the intercept from
the equation for a straight line:
y = mx + b
lnN = -kx + lnNo
6.4019 = -0.1260(20.00) + b
Solving for b = lnNo = 8.9227
6. Using the intercept value, find the initial activity, No
Since 8.9227 = ln No, then:
No = e = 7500 (counts)
8.9227
4. To find the half life, t1/2, use the equation:
t1/2 = ln2 / k = 0.6931 / 0.1260 = 5.50 min
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