Answer to Question #241562 in Physics for Joanne

Question

Determining which parts of the EM spectrum can be used to "see" an object of a particular size. Like... a human for example. Explaining why.

Answer 1

The part of the EM spectrum that can be used to "see" an object of a human size are infrared (because living humans emit short-length infrared waves), optical (because we see each other by receiving the light waves reflected from another people toward our eyes), and other parts of spectrum of shorter wavelengths because there will be no diffraction and one way or another we will be seen by observing mechanisms.