What is the light intensity at the surface

Reference no: EM13145447

Question 1.

As light passes through transparent materials (water, glass, plastic) some of the light is absorbed. The Beer-Lambert Law is used to describe the change in light intensity when light travels in such a material:

I = I_oe^-kx

where I0 and I give the light intensity (in lumens) before and after passing though a distance x (in meter) of the material. The constant k depends on the type of material.

A researcher measures light intensity at dierent depths in a lake. At a depth of 2 m the light intensity is 12 lm, and at a depth of 3 m it is 7.9 lm.

(a) Use the experimental values to nd the constant k for the water in the lake.

(b) What is the light intensity at the surface of the lake on the day of the experiment?

(d) If light intensity drops below 0.15 lm, a certain species of algae cannot survive. Find the depth below which there is insucient light for the algae to survive.

Question 2.

The standard form of the equation of a parabola is y = ax²+bx+c. In the gure the graphs of two parabolas are given.

734_What is the light intensity at the surface.png

(a) For the two parabolas y = f(x) and y = g(x), are the coecients a, b and c positive or negative? Give reasons for your answers.

(b) In each case is b²> 4ac or b² < 4ac? Give reasons for your answers.

Question 3.

1783_What is the light intensity at the surface1.png

There are ve points, labeled A to E, on the graph for the function f(x) = (5x² - 17)e 0:5x. Find the coordinates for these points to 2 decimal digits, by using derivatives and algebra. Show your working.

Question 4.

(a) Use the algebraic de nition of the derivative 1140_What is the light intensity at the surface2.png for nd the derivative for the function f(x) = 1/ 2x - 5

(b) Use the quotient rule to nd the derivative of f(x) = 1/2x-5

Show that your answer is the same as in (a).

(c) Use the algebraic de nition as well as the quotient rule to nd the derivative for f(x) = x/2-3x and again show that the answers are the same.

Question 5.

The relative growth rate of the world population has been decreasing steadily in recent years. Some population models predict that the world population will eventually stabilize at a level that the planet can support. One such model (with t = 0 in 2000), is

1756_What is the light intensity at the surface3.png

The relative growth rate of the population at time t is de ned as p(t)/p(t)'

(a) According to this model, what was the relative growth rate of the world population at the beginning of 2000? Give your answer as a percentage and round to 3 decimal digits.

(b) How does this value compare with the known relative growth rate of the world population in 2000? Give references for the data source(s) that you use.

Question 6.

The concentration of a certain medication in the bloodstream, t hours after taking it, is given by C(t) = 38t/t²+2

(C in ppm, parts per million).
(a) Sketch a graph for the concentration.
(b) Calculate C0(0:5) and C0(5). Give the units for these rates.
(c) Explain the dierence in these rates by referring to the graph.

Question 7

Sketch neat graphs of the curves y = 3 + 2x x2 and x = 3 y on the same coordinate system. Shade the region enclosed by the two curves. Use a de nite integral to determine the area of this region. (You may use the online plotter on AUTonline for this question.)

Question 8.

Determine the following de nite integrals.

1724_What is the light intensity at the surface4.png

Reference no: EM13145447

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