A Physicist Is Asked to Design an Infrared System to Detect

Multiple Choice

A physicist is asked to design an infrared system to detect human beings (at a normal temperature of 310 K) in darkness. What would the wavelength of peak sensitivity of the equipment need to be?

A) 9.35 $\mu$ m
B) 0.935 $\mu$ m
C) 0.00094 $\mu$ m
D) 90 $\mu$ m