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Question:
A colony of 200 bacterial cells is placed in a petri dish. After 5 hours, the bacteriologist finds 1,250 bacterial cells in the dish and assumes that the bacteria are growing at an exponential rate. In such a case, what is the growth constant associated with this colony of cells?
A
0.37
explanation
1212Use the general form of the exponential equation to represent the bacterial growth: 
, where Q is the population at time t, 
is the initial population, and k is the growth constant.
Substitute the given values into the equation and solve for k:
, which gives
, and taking the natural log of both sides
, and isolating k
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