A heat lamp emits infrared radiation whose RMS electric field is Ems=2800N/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 4. 0 cm. What is the average power delivered to the leg?
(c) The portion of the leg being irradiated has a mass of 0. 28 kg and a specific heat capacity of 3500 JJ/kg⋅C∘. How long does it take to raise its temperature by 2. 0 C∘? Assume that there is no other heat transfer into or out of the portion of the leg being heated.