4. [-/1 Points] DETAILS MY NOTES CRAUDCOLALG6 4.2.EX.018.MI. PRACTICE ANOTHER When light strikes the surface of a medium such as water or glass, its intensity decreases with depth. The Beer-Lambert-Bouguer law states that the percentage of decrease is the same for each additional unit of depth. In a certain lake, intensity decreases about 65% for each additional meter of depth. (a) Explain why intensity I is an exponential function of depth d in meters. Intensity I is an exponential function of depth since I decreases by an increasing percentage as a function of depth. Intensity I is an exponential function of depth since I decreases by a constant percentage as a function of depth. Intensity I is an exponential function of depth since I increases by a decreasing percentage as a function of depth. Intensity I is an exponential function of depth since I increases by an increasing percentage as a function of depth. Intensity I is an exponential function of depth since I decreases by a decreasing percentage as a function of depth. (b) Use a formula to express intensity I as an exponential function of d. (Use I to denote the initial intensity.) I(d ) = (c) Explain in practical terms the meaning of I. I represents the intensity (---Select--- (d) At what depth will the intensity of light be one-tenth of the intensity of light striking the surface? (Round your answer to two decimal places.) Need Help? Read It Master It Submit Answer 5. [0/1 Points] DETAILS MY NOTES CRAUDCOLALG6 4.2.EX.019.MI. PREVIOUS ANSWERS PRACTICE ANOTHER When light strikes the surface of a medium such as water or glass, its intensity decreases with depth. The Beer-Lambert-Bouguer law states that the percentage of decrease is the same for each additional unit of depth. In the ocean, the photic zone is the region where there is sufficient light for photosynthesis to occur. (See the figure below.) For marine phytoplankton, the photic zone extends from the surface of the ocean to a depth where the light intensity is about 1% of surface light. Consider a region of the ocean where the depth of the photic zone is about D = 16 meters. In this region of the ocean, by what percentage does light