The number of bacteria in a certain population increases according to a continuous exponential growth model, with a growth rate parameter of

Question

The number of bacteria in a certain population increases according to a continuous exponential growth model, with a growth rate parameter of 2.4% per hour. How many hours does it take for the size of the sample to double?

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Orla Orla 5 years 2021-07-30T03:16:37+00:00 1 Answers 341 views 0

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  1. binhan
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    2021-07-30T03:17:44+00:00
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    Answer:

    It would take approximately 289 hours for the population to double

    Explanation:

    Recall the expression for the continuous exponential growth of a population:

    N(t)=N_0\,e^{kt}

    where N(t) measures the number of individuals, No is the original population, “k” is the percent rate of growth, and “t” is the time elapsed.

    In our case, we don’t know No (original population, but know that we want it to double in a certain elapsed “t”. We also have in mind that the percent rate “k” would be expressed in mathematical form as: 0.0024 (mathematical form of the given percent growth rate).

    So we need to solve for “t” in the following equation:

    2\,N_0=N_0\,e^{0.0024\,t}\\\frac{2\,N_0}{N_0} =e^{0.0024\,t}\\2=e^{0.0024\,t}\\ln(2)=0.0024\,t\\t=\frac{ln(2)}{0.0024} \\t=288.811\,\, hours

    Which can be rounded to about 289 hours

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