Here's why:

* Electromagnetic Spectrum: Both gamma rays and X-rays are part of the electromagnetic spectrum. The electromagnetic spectrum arranges different types of electromagnetic radiation by their frequency and wavelength.

* Frequency and Wavelength: Frequency and wavelength are inversely proportional. This means that higher frequency radiation has a shorter wavelength.

* Position on the Spectrum: Gamma rays are located at the high-frequency, short-wavelength end of the electromagnetic spectrum, while X-rays are located at a lower frequency but still higher than visible light, ultraviolet, and infrared radiation.

In summary: Gamma rays have a higher frequency and shorter wavelength than X-rays.