You are hired to design an infra red camera that will detect intruders in the dark. Suppose that the human body is blackbody at 37oC (310 K):
A. Find what wavelength should your camera be able to detect?
B. Find how much power per square meter does the human body radiate?
C. Find how many photons per second are emitted per square meter (suppose that all photons are emitted at the wavelength found in part A)?