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Answer the following question: A 100 lumen laser is pointed at 2L of water at 20 degrees celsius. If it takes 4200J to heat 1L

Answer the following question:

A 100 lumen laser is pointed at 2L of water at 20 degrees celsius. If it takes 4200J to heat 1L of water 1 degree and if it takes 6 days for the water to heat up to 30 degrees celsius, assuming perfect delivery and absorption of energy and no energy loss over this time. What is the wavelength of the laser that was used? Assume that 1 lumen =4.091015 photons /s

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