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renewable energy

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If a solar cell with 2 m^2 surface area is placed in a direct light having 780 W/m power density provides an output power of 346 W, what is the efficiency in percent? (0 to 100 %, no decimals). Provide your answer in base units (no scientific notation or magnitude modifiers like k or M). Use the abbreviation for the unit not the full unit name.

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