The intensity of light I through a lake at a depth of x meters is given by the following formula.   dI/dx=(−1.31)I   ​(a) At what depth is the intensity of the light half that of the intensity at the​ surface, I0​? ​(b) At 5 meters​ deep, what is the intensity of the light as a fraction of I0​?

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Q: refractive index

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Interference of sound

Seiche

A seiche is an oscillating standing wave in a body of water. The term seiche pronounced saysh) can be understood by the sloshing of water back and forth in a swimming pool. The same phenomenon happens on a much larger scale in vast bodies of water including bays and lakes. A seizure can happen in any enclosed or semi-enclosed body of water.