Consider the following parts of spectra : 1. Visible 2. Infrared 3. Ultraviolet 4. Microwave Which one of the following is the correct sequence in which their wavelenghts increase?

The electromagnetic spectrum is organized by wavelength and frequency. Ultraviolet (UV) radiation has shorter wavelengths than visible light, typically ranging from about 10 nm to 400 nm [t1][t4]. Visible light follows, spanning approximately 400 nm to 700 nm [t2][t8]. Infrared (IR) radiation has longer wavelengths than visible light, starting from 700 nm up to about 1 mm [t4]. Microwaves possess even longer wavelengths, generally ranging from 1 mm to 1 meter [t1][t3]. Therefore, the correct sequence of increasing wavelengths is Ultraviolet (3), followed by Visible (1), then Infrared (2), and finally Microwave (4). This order (3-1-2-4) reflects the transition from high-energy, short-wavelength radiation to lower-energy, long-wavelength radiation across the spectrum [t5][t6].

Sources

1. [1] https://imagine.gsfc.nasa.gov/science/toolbox/emspectrum1.html