D Question 3 1 pts A single pulse of a laser yields an average of 3.11 x 1017 photons with λ = 621 nm. If melting ice to

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D Question 3 1 pts A single pulse of a laser yields an average of 3.11 x 1017 photons with λ = 621 nm. If melting ice to water at 0°C requires 6.01 kJ/mol, what is the fewest number of laser pulses need to melt 36 g of ice? Question 4 1 pts A photovoltaic cell converts light into electrical energy. Suppose a certain photovoltaic cell is only 69.4% efficient, in other words, that 69.4% of the light energy is ultimately recovered. If the energy output of this cell is used to heat water, how many 573.7 nm photons must be absorbed by the photovoltaic cell in order to heat 26 g of water from 24.63°C to 65.07°?