If you want to design a device that will detect animals at night by the radiation they emit,even if the night is totally dark,to what wavelength range should you make the device 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 thermal radiation in the infrared range, even at night. Making a device sensitive to this range will allow it to detect animals even in total darkness.

If You Want to Design a Device That Will Detect