17. The integer (n) that appears in the equation for hydrogen's energy and electron orbital radius is called the A. energy of an electron in its orbit B. electron orbital radius C. principal quantum number D. mass of the electron 18. A(n) has the same mass as an electron, but has the opposite charge. A. proton B. positron C. quark D. lepton 19. Which one is an insulator? A. lead B. silver C. copper D. plastic16. Deuterium (1) has a mass of 2.014102 u. Calculate it mass defect. Use these values to solve the problem: mass of hydrogen = 1.007825 u mass of neutron = 1.008665 u 1 u = 931.49 MeV A. -0.5063005 B. -0.002388 C. -1.011053 D. -2.0188787. How do dopants increase the conductivity of semiconductors? A. They add net charge to the semiconductor. B. They increase the forbidden gap. C. They turn them into intrinsic semiconductors. D. They make extra electrons or holes available.21. A 8.6-kg bowling ball rolls with a velocity of 10.2 m/s. What is the de Broglie wavelength of the bowling ball? (h = 6.63x10-34 J.S) A. 5.6 x10-34 m B. 7.6x10-36 m C. 7.8x10-34 m D. 1.3x1031 m24. For the energy-band diagram shown below, which one represents a material with an extremely high resistance? Material A Material B Material C A. Material A B. Material B C. Material C D. not enough information is given