Chapter 9 - Electrons in Atoms and the Periodic Table - Exercises - Problems - Page 317: 37

a) radio waves, infrared, x-ray b) radio waves, infrared, x-ray c) x-ray, infrared, radio waves

Radiation has an inverse relationship with respect to energy and wavelength. The longer the wavelength the lower the energy. This is a direct relationship with frequency, so the higher the frequency the shorter the wavelength.