Here's why:

* Electromagnetic Spectrum: Electromagnetic radiation encompasses a wide range of wavelengths, from very long radio waves to extremely short gamma rays. This range is known as the electromagnetic spectrum.

* Wavelength and Energy: The wavelength of electromagnetic radiation is inversely proportional to its energy. This means shorter wavelengths carry higher energy.

* Gamma Rays: Gamma rays are the highest-energy form of electromagnetic radiation. They have the shortest wavelengths, typically less than 10 picometers (10^-12 meters).

Other forms of radiation with relatively short wavelengths include:

* X-rays: Wavelengths range from 0.01 to 10 nanometers (10^-9 meters).

* Ultraviolet (UV) radiation: Wavelengths range from 10 to 400 nanometers.

Let me know if you'd like more details about any of these types of radiation!