The intensity of light(1), d meters below the surface of a reservoir is given by the formula I = 3.5 xe-0.1d d 20 %3D (i) What is the intensity of light at the surface of the reservoir? (ii) What is the intensity (correct to three significant figures) of light five meters below the surface? (iii) At what depth (correct to three significant figures) is the light intensity equal to 1.5 units? (iv) At what depth (correct to three significant figures) is the light intensity half that at the surface?

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Chapter3: Polynomial Functions
Section3.5: Mathematical Modeling And Variation
Problem 7ECP: The kinetic energy E of an object varies jointly with the object’s mass m and the square of the...
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The intensity of light(1), d meters below the surface of a reservoir is given by the formula
I = 3.5 xe-0.1d d 20
%3D
(i) What is the intensity of light at the surface of the reservoir?
(ii) What is the intensity (correct to three significant figures) of light five meters below the
surface?
(iii) At what depth (correct to three significant figures) is the light intensity equal to 1.5 units?
(iv) At what depth (correct to three significant figures) is the light intensity half that at the
surface?
Transcribed Image Text:The intensity of light(1), d meters below the surface of a reservoir is given by the formula I = 3.5 xe-0.1d d 20 %3D (i) What is the intensity of light at the surface of the reservoir? (ii) What is the intensity (correct to three significant figures) of light five meters below the surface? (iii) At what depth (correct to three significant figures) is the light intensity equal to 1.5 units? (iv) At what depth (correct to three significant figures) is the light intensity half that at the surface?
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