4 The mass, m grams, of a radioactive substance is given by the formula
m = m0e^-kt, where t is the time in days after the mass was first recorded and
mo and k are constants.
The table below shows experimental values of tand m.
t=10,20,30,40,50
m=40.9,33.5,27.4,22.5,18.4
a Draw the graph of ln m against t.
b Use your graph to estimate the value of mo and k.
C Estimate the value of m when t = 27.
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