Physics
Electromagnetic Spectrum
Quick fact
The electromagnetic spectrum contains all forms of light, from the radio waves used by astronomers to the gamma rays that come from distant stars.
Why this is interesting
Have you ever wondered why the sky is blue or how your phone can receive signals through walls? The answer lies in a hidden world of invisible waves that surround us every second.
Read the full explanation
Understanding Electromagnetic Spectrum
Imagine a vast rainbow stretching across space. At one end are long, slow radio waves, and at the other end are short, fast gamma rays. In between are microwaves, infrared, visible light, ultraviolet, and X-rays. These waves all travel at the same speed but differ in how they interact with matter.
A deeper explanation
The electromagnetic spectrum is a continuous range of radiation produced by charged particles accelerating or decelerating. Each type of wave has a unique wavelength and frequency, which determine its energy and interaction with materials. For example, visible light allows us to see the world, while X-rays can reveal hidden structures inside our bodies.