Which region of the electromagnetic spectrum are each of these wavelengths near? a. ultraviolet 10-8 to 10-7 meters b. x-ray 10-11 to 10-8 meters c. gamma ray 10-16 to 10-11 meters d. smaller than 10-20 meters. cannot detect wave-like properties. only particle-like behavior will be observable. particle mass (kg) velocity (m/s) wavelength (m) region electron 9.11×10-31 5.81×106 baseball 0.140 40.2 alpha particle 6.64×10-27 1.52×107