REMBE Electrotherapy Practice Test

Short-wave infrared sits in the near to short infrared part of the spectrum, roughly around 1.0 to 3.0 micrometers. It’s the portion of infrared radiation you get from hot objects and broad, hot-body emitters, which is why a tungsten filament—an ordinary hot filament used in lamps—produces infrared radiation that includes SWIR components. The statement about the wavelength range is the one that doesn’t fit SWIR. A range stated as 1500 to 12,000 micrometers covers 1.5 micrometers up through 12 micrometers, which spans into mid- and far-infrared. SWIR, by contrast, ends well before that, around 3 micrometers. That mismatch is why this option is the exception. The other points line up with SWIR concepts: it is a form of infrared radiation emitted by hot sources like a tungsten filament, and it can penetrate skin to a measurable depth (typically millimeters, depending on wavelength and tissue), which is consistent with how SWIR is used in imaging and therapy contexts.