In this note, we are going to learn about a topic called “What is Electromagnetic Spectrum?” and about 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 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.
Here are the different regions of electromagnetic spectrum –
| 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 |