Longer wavelength means higher frequency and lower energy. Longer wavelength means lower frequency and higher energy. Longer wavelength means higher frequency and higher energy. Longer wavelength means lower frequency and lower energy. There is no simple relationship because different photons travel at different speeds.
X rays have higher energy than radio waves.
X rays have higher frequency than radio waves. X rays and radio waves are both forms of light, or electromagnetic radiation. X rays have shorter wavelengths than radio waves. X rays travel through space faster than radio waves. We can see each other in the classroom right now because we emit visible light.