Here's why:

* Electromagnetic Spectrum: The electromagnetic spectrum is a range of all types of electromagnetic radiation, ordered by wavelength (and frequency).

* Wavelength and Frequency: Wavelength and frequency are inversely proportional. This means:

* Longer wavelength = Lower frequency

* Shorter wavelength = Higher frequency

* Gamma Waves: Gamma waves have the highest frequency and therefore the shortest wavelength within the electromagnetic spectrum.

Think of it like this: imagine a rope with waves on it. If you make the waves very close together (short wavelength), you'll have a high frequency (lots of waves passing a point in a short time). On the other hand, if you make the waves spread out (long wavelength), you'll have a low frequency (fewer waves passing a point in the same amount of time).