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Back to 29.8 The Particle-Wave Duality Reviewed

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A certain heat lamp emits 200 W of mostly IR radiation averaging 1500 nm in wavelength. (a) What is the average photon energy in joules? (b) How many of these photons are required to increase the temperature of a person’s shoulder by 2.0ºC2 . 0º \text{C}, assuming the affected mass is 4.0 kg with a specific heat of 0.83 kcal/kg⋅ºC0 .\text{83 kcal} /\text{kg} \cdot º\text{C}. Also assume no other significant heat transfer. (c) How long does this take?

OpenStax College Physics 2e, 29.8 The Particle-Wave Duality Reviewed, exercise 6

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.