Assuming you mean the regions of the electromagnetic spectrum then:
From Low to High wavelength
Radio
Microwave
Infra Red
Visible
Ultra Violet
X-Ray
Gamma Ray
Bear in mind that these regions tend to merge into one another and are regionalised mainly for practical purposes. Go to the Related Links for more detail
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The bands of the electromagnetic spectrum are radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. Each band has different wavelengths and frequencies, which determine their properties and uses.
The bands of the electromagnetic spectrum from short to long wavelengths are: gamma rays, X-rays, ultraviolet light, visible light, infrared light, microwaves, and radio waves.
The division of the radio and microwave spectrum into bands of different wavelengths allows for efficient use of the electromagnetic spectrum. Different technologies and applications require specific wavelengths for optimal performance. Organizing them into bands helps prevent interference between different systems operating at the same time.
The entire electromagnetic spectrum frequencies, from the lowest to the highest frequencies, are collectively called the electromagnetic spectrum.
Spectrum re-purposing involves reallocating frequency bands in the electromagnetic spectrum for different uses. This process allows for more efficient utilization of the spectrum, opening up opportunities for new technologies and services. It often involves transitioning existing users to different frequency bands to accommodate the changing demands for wireless communications.
Wi-Fi operates on radio waves in the 2.4 GHz or 5 GHz frequency bands within the electromagnetic spectrum. These frequencies allow Wi-Fi signals to transmit data wirelessly between devices like smartphones, laptops, and routers.