Integrated Concepts

Assume the mostly infrared radiation from a heat lamp acts like a continuous wave with wavelength $1.50 \mu \text{m}$. (a) If the lamp’s 200-W output is focused on a person’s shoulder, over a circular area 25.0 cm in diameter, what is the intensity in $\text{W}/\text{m}^{2}$? (b) What is the peak electric field strength? (c) Find the peak magnetic field strength. (d) How long will it take to increase the temperature of the 4.00-kg shoulder by $2.00º C$, assuming no other heat transfer and given that its specific heat is $3 . \text{47} \times \text{10}^{3} \text{ J}/\text{kg} \cdot º\text{C}$?