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A heat lamp emits infrared radiation whose rms electric field is Erms = 3500 N/C. (a) What is the average intensity of the radiation? (b) The radiation is focused on a person's leg over a circular area of radius 3.4 cm. What is the average power delivered to the leg? (c) The portion of the leg being radiated has a mass of 0.34 kg and a specific heat capacity of 3500 J/(kg·C°). How long does it take to raise its temperature by 2.8 C°? Assume that there is no other heat transfer into or out of the portion of the leg being heated.

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