Here's why:

* Electromagnetic Spectrum: X-rays and gamma rays are both forms of electromagnetic radiation, but they occupy different parts of the electromagnetic spectrum.

* Frequency and Energy: Frequency and energy are directly proportional. This means that higher frequency waves have more energy.

* Gamma Rays: Gamma rays have the highest frequencies and energies within the electromagnetic spectrum. They are emitted from the nucleus of an atom during radioactive decay.

* X-rays: X-rays have lower frequencies and energies than gamma rays. They are produced by the acceleration of charged particles, such as electrons.

In summary:

* Gamma rays: Higher frequency, higher energy

* X-rays: Lower frequency, lower energy