A certain heat lamp emits 200 W of mostly IR radiation averaging 1500 nm in wavelength. The average photon energy in joules is 1.3 x J. Number of photons are required to increase the temperature of a person's shoulder by 2.0°C, assuming the affected mass is 4.0 kg with a specific heat of 0.83 kcal/kg • °C is 2.1 x . Also assume no other significant heat transfer. How long does this take?
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