In a certain lake the intensity of light from the surface decreases by  40% for each additional meter of depth.  
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A: Explain why light intensity is an exponential function of depth.
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B: Using for intensity at the surface of the lake,  write a formula that gives the intensity  I of light ?d meters below the surface.
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C: At what depth will light intensity be one tenth of surface intensity? Round your answer to two decimal places if necessary.
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What will be an ideal response?


A:  Intensity changes  by the same percentage for each additional meter of depth.

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B:

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C: 4.51 meters

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Mathematics

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