1. The problem statement, all variables and given/known data A python can detect thermal radiation with intensity greater than .60 W/m2. A typical human body has a surface area of 1.8 m2, a surface temperature of 30°C, and an emissivity e=0.97 at infrared wavelengths. What is the maximum distance from which a python can detect your presence? You can model the human body as a point source of radiation. I = .60 W/m2 e = 0.97 T = 303 K A = 1.8 m2 d = ? (m) 2. Relevant equations λ = (2.9*106 nm⋅K)/ Temp (in K) I = P/(4πr2) Q/Δt = eσAT4 σ = 5.67 * 10 -8 W/(m2⋅K4) 3. The attempt at a solution λ = (2.9*106 nm⋅K)/ 303 K = 9571 nm And if P = Watts, A = m2, and I = W/m2 Then, P = I*A → .60*1.8 = 1.08 W .60 W/m2 = (0.97 * 1.08 W)/(4πr2) r = .37 m Honestly, I'm not sure what else to do. I don't think "P" is correct.