Applications of Differential Equations
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Questions and Answers

In the context of growth and decay, what does the differential equation $\frac{dN}{dt} = kN$ represent?

  • Linear growth
  • Linear decay
  • Exponential decay
  • Exponential growth (correct)
  • What is the original amount of bacteria in a culture if it is known to grow at a rate proportional to the amount present, and after 1 hour there are 1000 strands, and after 4 hours there are 3000 strands?

  • 5000 strands
  • 693.3641 strands (correct)
  • 1200 strands
  • 800 strands
  • What is the half-life of a substance if its decay can be modeled by the equation $N(t) = N_0e^{-kt}$?

  • $\frac{k}{2}$
  • $\frac{k}{0.693}$
  • $\frac{1}{k}$
  • $\frac{0.693}{k}$ (correct)
  • If a radioactive substance decays from 800 grams to 100 grams in 30 days, what is the decay constant $k$ in the equation $N(t) = N_0e^{-kt}$?

    <p>0.0316</p> Signup and view all the answers

    What does a negative value of the constant of proportionality $k$ signify in the context of growth and decay?

    <p>Decay</p> Signup and view all the answers

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