Physics
Electromagnetic Spectrum
Quick fact
The electromagnetic spectrum spans from the longest radio waves to the shortest gamma rays, covering more than 99% of the universe's energy.
Why this is interesting
Have you ever wondered how your phone sends signals or how doctors see inside the body? The answer lies in invisible waves that travel through space.
Read the full explanation
Understanding Electromagnetic Spectrum
Imagine a rainbow: it’s made up of colors that we can see. The electromagnetic spectrum is like a giant rainbow but includes invisible types of light, such as ultraviolet and infrared. These different types of waves all travel at the same speed through space but have different wavelengths and energies.
A deeper explanation
The electromagnetic spectrum is composed of waves that vary in wavelength and frequency. Longer waves have lower energy and are used for communication (like radio), while shorter, higher-energy waves like X-rays can penetrate matter to reveal hidden structures. This diversity allows us to use radiation for everything from medical imaging to astronomy.