The Intensity $\mathrm { L } ( \mathrm { x } )$

question 46

Multiple Choice

The intensity $\mathrm { L } ( \mathrm { x } )$ of light $\mathrm { x } \mathrm { ft }$ beneath the surface of a lake satisfies the differential equation $\frac { \mathrm { dL } } { \mathrm { dx } } = - 0.05 \mathrm {~L}$ . At what depth, to the nearest foot, is the intensity one tenth the intensity at the surface?

• A) 46 ft
• B) 31 ft
• C) 23 ft
• D) 69 ft

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