If one wants to design a device that will detect animals at night by the radiation they give off, even if the night is totally dark, to what wavelength range should the device be made sensitive?
A) ultraviolet
B) visual, like the human eye
C) No device can detect objects on a totally dark night.
D) infrared

Question

Quizplus · Accepted Answer

Animals emit heat in the form of infrared radiation, which can be detected even in total darkness. Devices sensitive to infrared wavelengths can thus detect animals by the heat they emit.

If One Wants to Design a Device That Will Detect