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(a) How many photons (wavelength = 660 nm) must be absorbed to melt a 1.90-kg block...

(a) How many photons (wavelength = 660 nm) must be absorbed to melt a 1.90-kg block of ice at 0 °C into water at 0 °C? (b) On the average, how many H2O molecules does one photon convert from the ice phase to the water phase? Take the latent heat of fusion of water to be 335 kJ/kg.

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