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Estimate how many photons of yellow light (? = 559 nm) must be absorbed by 1.0...

Estimate how many photons of yellow light (? = 559 nm) must be absorbed by 1.0 cm2 of human skin to raise the skin temperature 1.5° C. Assume that the photon energy is absorbed by 1.0 cm3 of tissue. As rough estimates of the tissue's density and specific heat, use the values for water. (The specific heat of water is 4186 J/kg–C°.)

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