Light intensity  I  as a function of depth  d  feet below the surface in some harbors is given approximately by the function I(d)  =  Io e– 0.23 d    where  Io  is the light intensity at the surface.  At what depth does only 30% of the surface intensity remain?

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Differential Equations

Have you ever observed the movement of the satellites and rockets or how the planets go around the sun in their orbits? How will you determine their motion? Definitely they follow some scientific laws and these kinds of problems are framed as differential equations.