up previous Index
Up: Lakes as Well-Mixed... Previous: Question 1
Let's continue with our three question quiz now. Click on the answer you believe is correct. If you don't feel comfortable about which model to use, go to the section on modeling. (You can also refer to the previous page for a summary of the three input function we are using.)

Question 2: A wastewater treatment plant empties its treated water, which contains ammonia, into the nearby lake. The ammonia concentrations are always within legal limits, but it is observed that the greatest concentration always occurs at about 5:00 PM, while the minimum concentration occurs at about 5:00 AM. Here, the best choice for representing the input function for the lake would be

  1. an impulse input function;
  2. a step input function;
  3. a sinusoidal input function.

John Hoggard <hoggard@math.vt.edu>
Last modified: Sun Aug 10 17:39:56 EDT 1997