If the wavelengths corresponding to ultraviolet, visible and infrared radiations are given as IUV, IVIS and HR respectively, then which of the following gives the correct relationship among these wavelengths?

The electromagnetic spectrum is categorized by wavelength, where ultraviolet (UV), visible (VIS), and infrared (IR) radiations occupy distinct ranges. Ultraviolet radiation has the shortest wavelengths among the three, typically ranging from 10 nm to 400 nm [2]. Visible light follows with a wavelength range of approximately 400 nm to 700 nm. Infrared radiation possesses the longest wavelengths of this group, extending from 700 nm up to 1 mm [1]. This progression is fundamentally linked to energy and frequency; as wavelength increases, frequency and photon energy decrease [2]. Therefore, the correct relationship is IUV < IVIS < HR, representing the increasing order of wavelengths from ultraviolet to visible and finally to infrared radiation.

Sources

1. [2] https://www.sciencedirect.com/topics/medicine-and-dentistry/ultraviolet-radiation
2. [1] https://www.sciencedirect.com/topics/engineering/infrared-radiation