Which of the following best describes the operation of FMIR technology?

FMIR technology, or Fourier Transform Infrared Spectroscopy, is specifically designed to detect infrared radiation. This technique measures the intensity of infrared light absorbed or emitted by a sample, making it particularly useful for identifying molecular structures and monitoring chemical compositions. Since FMIR relies on the unique fingerprint of molecular vibrations in the infrared spectrum, it effectively detects the infrared radiation emitted based on the interaction with the sample.

The other choices represent different physics principles. Electromagnetic waves encompass a broad range of wavelengths, but FMIR technology specifically targets the infrared part of this spectrum to function properly. Sound waves do not pertain to FMIR, as this technology is focused on light rather than acoustic phenomena. Lastly, while visible light is part of the electromagnetic spectrum, FMIR does not operate within that range but instead within the infrared spectrum, which is just beyond visible light. Thus, the correct answer highlights the nature of FMIR technology and its focus on infrared radiation detection.