Electromagnetic Waves

Understanding electromagnetic radiation, the spectrum, and wave applications

Topics

How does radio work?

Radio works by transmitting information on electromagnetic radio waves. A transmitter converts sound or data into radio waves that travel through space, and a receiver picks up these waves and converts them back into sound or data.

How does WiFi work?

WiFi works by transmitting data using radio waves in the microwave frequency range (2.4 GHz and 5 GHz). A router converts digital data into radio signals that devices receive and convert back to data, enabling wireless internet access.

What are electromagnetic waves?

Electromagnetic waves are oscillating electric and magnetic fields that travel through space, transferring energy without requiring a medium. They include radio waves, microwaves, light, X-rays, and gamma rays, all traveling at the speed of light.

What is light?

Light is electromagnetic radiation that our eyes can detect, with wavelengths between about 400-700 nanometers. It behaves as both a wave and a particle (photon), traveling at the speed of light and carrying energy.

What is the electromagnetic spectrum?

The electromagnetic spectrum is the full range of all possible frequencies of electromagnetic radiation, from low-frequency radio waves to high-frequency gamma rays. It includes radio, microwave, infrared, visible light, ultraviolet, X-ray, and gamma ray regions.