26. The lasing energy levels of a laser are separated by 2.95 eV. What wavelength of light does it emit? A. 242 nm B. 420 nm C. 636 nm D. 844 nm 27. What happens to the conductivity of a material as the energy gap decreases? A. It increases. B. It decreases. C. It remains the same. D. It follows no general rule. 28. What is the common name for a particles? A. an electron B. a positron C. helium nuclei D. high energy photons34. According to the figure below, what is the approximate frequency needed to eject an electron with a minimum kinetic energy of 2 eV? Maximum Kinetic Energy of Photoelectrons v. Frequency 3 2 Maximum kinetic energy (eV) 5 6 8 9 10 11 12 Frequency (X1014 Hz) A. 4.5x1014 Hz B. 8.1x1014 Hz C. 9x1014 Hz D. 10x10 14 Hz43. A(n) force holds the protons and neutrons together in the nucleus of an atom. A. gravity B. strong nuclear C. electrical D. weak nuclear45. What is another name for an integrated circuit? A. transistor B. semiconductor C. diode D. microchip46. De Broglie's theory of electron wavelike properties was verified by independent experiments through diffraction. A. positron B. neutron C. electron D. proton50. The figures below show a diode used with two kinds of biasing. What is the direction of conventional current in each figure A and B? R R p-type n-type p-type n-type 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