10. Explain how astronomers are able to determine the frequency of a wave if they only know the wavelength? 11. Which travels faster, a radio wave or U.V light? ___________ 12. If the wavelength of light is doubled, what will happen to the frequency? _________ 13. a. Which contains more energy, Infrared or Visible light? _________ b. Which has more energy, blue or red light? _________14. What do you call light when it behaves like a particle? _________ 15. Regarding the photoelectric effect, the more energy the photons hit the metal plate, the faster the electrons fly off from the plate for all photon energies. a. a. True b. b. False