22. An n-type semiconductor conducts electricity with A. electrons. B. protons C. holes. D. neutrons. 23. An amplifier switch made of doped semiconducting material is a A. semiconductor. B. transistor. C. diode. D. microchip 24. The nitrogen isotope has a mass of 15.010109 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. -4.145286 B. -0.113986 C. -7.174641 D. -15.237241 25. Fusion occurs when A. nuclei decay. B. two smaller nuclei combine to form a larger one. C. a large nucleus is split. D. radioactive particles are emitted from the nucleus. APP 26. How much of a 64.0-g sample of hydrogen-3 will remain after 73.8 years? Hall-Lives of Selected Isotopes Isotope Half-Lite Radiation Produced Hydrogen 12.3 Crbm Cobalt 107 days A. 0.25 g B. 1.09 C. 0.50 g D. 0.13 g27. What type of transistor has a center that is an n-type semiconductor? A. pop-transistor B. p-transistor C. n-transistor D. non-transistor 28. The figures below show a diode used with two kinds of biasing, Which way are electrons flowing in each figure A and B? I A. counterclockwise in A and clockwise in B B. clockwise in A and counterclockwise in B C. clockwise in both A and B D. counterclockwise in both A and B 29. Which is NOT an example of an insulator in the kitchen? A. an oven mitt B. a wooden spoon C. a plastic measuring cup D. pots and pans 30. The integer, n, is called the and determines the values of radii of electron orbits and energy of electrons in hydrogen. A. mass of the electron B. energy of an electron in its orbit C. principal quantum number D. electron orbital radius 31. If the frequency of the incident light shone on a metal is below the no level of intensity will cause ejection of electrons. A. emission spectrum. B. threshold frequency. C. work function. D. diffraction level