In this note, we will learn what is the electromagnetic spectrum and its different regions. Welcome to Poly Notes Hub, a leading destination for engineering notes for diploma and degree engineering students.

Author Name: Arun Paul.

What is the Electromagnetic Spectrum?

It includes all forms of electromagnetic radiation, which are waves of electric and magnetic fields that flow through space. These waves differ in wavelength and frequency, and the electromagnetic spectrum includes the complete range of wavelengths and frequencies.

Different Regions of Electromagnetic Spectrum

Here we have listed the different regions of the electromagnetic spectrum with their Wavelength, Frequency, and uses.

Wave	Wavelength	Frequency	Uses
1. Radio Wave	> 1 mm ( upto km )	<300 GHz	Communication (radio, television, cell phones), radar
2. Microwaves	1 mm−1 cm	300 MHz−300 GHz	Microwave ovens, Wi-Fi, radar, satellite communications
3. Infrared	700 nm−1 mm	300 GHz−430 THz	Remote controls, thermal imaging, night vision, heating
4. Visible Light	400 nm−700 nm	430 THz−770 THz	Human vision, photography, illumination
5. Ultraviolet	10 nm−400 nm	770 THz−30 PHz	Sterilization, fluorescent lights, tanning
6. X-Rays	0.01 nm−10 nm	30 PHz−30 EHz	Medical imaging, security scanning, material analysis
7. Gamma Rays	< 0.01 nm	> 30 EHz	Cancer treatment, sterilization, astrophysical observations

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Uses of the Electromagnetic Spectrum in Communication Engineering

• Radio Waves – Radio broadcasting and wireless communication.
• Microwaves – Satellite communication, radar, and mobile networks.
• Infrared Waves – Remote controls and short-range communication.
• Visible Light – Optical communication and Li-Fi.
• Ultraviolet Waves – Specialized optical and satellite communication.
• X-Rays – High-frequency imaging and specialized communication applications.
• Gamma Rays – Specialized space and deep-space communication research.