Chapter 4.2, Problem 19E

Reminder Round all answers to two decimal places unless otherwise indicated.

The Photic Zone This is a continuation of Exercise 18. In the ocean, the photic zone is the region where there is sufficient light for photosynthesis to occur. (See Figure 4.12.) 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. Near Cape Cod, Massachusetts, the depth of the photic zone is about $16\text{meters}$. In waters near Cape Cod, by what percentage does light intensity decrease for each additional meter of depth?