<span>The electromagnetic spectrum is a continuum of all electromagnetic waves arranged according to frequency and wavelength. The sun, earth, and other bodies radiate electromagnetic energy of varying wavelengths.</span>
The correct answer is the option A which is radio waves, microwaves, visible light, x-rays.
Explanation:
Electromagnetic spectrum is the graph describing the ranges of frequencies of different electromagnetic waves.
As frequency and wavelength are inversely proportional.
The waves with long wavelength have low frequency and waves with short wavelength have high frequency.
Rdiowaves have long wave length and low frequency and microwaves have frequency more than radio waves and visible waves have high but x rays have of frequency of all given in list.
Hence on the bases of frequency:
Radio waves ≤ Micro waves ≤ Visible waves ≤ x-rays