9. Which of the following forms of electromagnetic radiation are capable of ionization? a. Radio waves b. Visible light c. Ultraviolet light d. X-rays A B C D 10. Which of the following forms of electromagnetic radiation have the shortest wavelength? a. Radio wave b. Television wave c. Radar wave d. Dental x-ray wave A B C D

9. **C** Ultraviolet light, and higher energy forms like X-rays and gamma rays, are capable of ionization. Ionization is the process of removing an electron from an atom or molecule, which requires a certain amount of energy. Radio waves and visible light do not have enough energy to cause ionization.<br /><br />10. **D** Dental x-ray waves have the shortest wavelength among the options listed. The electromagnetic spectrum is arranged in order of increasing wavelength: gamma rays, x-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. Since dental x-rays are x-rays, they have a shorter wavelength than radio, television, or radar waves, which are all forms of radio waves.<br />