Which of the following is true about infrared radiation?

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Infrared radiation is characterized by having a longer wavelength than visible light, which ranges from approximately 400 to 700 nanometers. Infrared radiation extends from about 700 nanometers to 1 millimeter, placing it just beyond the visible spectrum. This distinction in wavelength is crucial because it explains why humans cannot see infrared radiation; our eyes are only sensitive to the visible spectrum, making it invisible to us.

The remaining options all misrepresent aspects of infrared radiation. It is not visible to the human eye, cannot be used in X-ray imaging since X-rays have much shorter wavelengths and higher energy levels than infrared radiation, and it is not the highest energy form of radiation, as higher energy forms include ultraviolet rays and X-rays. Thus, the assertion that infrared radiation has a longer wavelength than visible light is correct, confirming that option B is the accurate choice.