It all depends upon where you place the boundaries of the infrared spectrum. The electromagnetic spectrum is a continuum and there is no exact boundary for any particular designation.
If you define IR as that radiation below red which is invisible then Yes it is invisible.
Infrared radiation has longer wavelengths than visible light.
Both are examples of electromagnetic radiation. Infrared has a longer wavelength (lower frequency) than visible light. Of course visible light is visible to humans and infrared is not (although long wave Infrared is sensible to humans as heat).
The three forms of radiation from the sun are visible light, infrared radiation, and ultraviolet radiation. Visible light is responsible for the light we see, while infrared radiation and ultraviolet radiation are not visible to the human eye but have important effects on Earth's climate and environment.
Infrared radiation has less energy (per photon) than visible light.
Infrared is directly below, next is x-ray, next is radio.
Ultraviolet radiation , visible light and infrared radiation
Ultraviolet radiation , visible light and infrared radiation
A campfire emits electromagnetic radiation in the infrared and visible light ranges.
Visible radiation: 370-750 nm. Infrared radiation: 750 nm-300 μm These wavelenghts are not long.
Infrared radiation.
infrared and ultraviolet
Infrared radiation.