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Answer:: A photovoltaic cell converts light into electrical energy. Suppose a certain photovoltaic cell is only 63.5% efficient, in other words, that 63.5% of the light energy is ultimately recovered. If the energy output of this cell is used to heat water, how many 520 nm photons must be absorbed by the photovoltaic cell in order .
Explanation:
You can answer that by looking at how much water got remained atop. The more water atop means less permeability. If something is permeable it let the water diffuse. So the answer is silt.