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Physics / College Physics 1 / Chapter 29 / Problem 74

College Physics | 1st Edition | ISBN: 9781938168000 | Authors: Paul Peter Urone, Roger Hinrichs

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Problem 74PE

Integrated Concepts

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 2.0ºC , assuming the affected mass is 4.0 kg with a specific heat of 0.83 kcal/kg ⋅ ºC . Also assume no other significant heat transfer. (c) How long does this take?

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QUESTION:

Problem 74PE

Integrated Concepts

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 2.0ºC , assuming the affected mass is 4.0 kg with a specific heat of 0.83 kcal/kg ⋅ ºC . Also assume no other significant heat transfer. (c) How long does this take?

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