6. combining which of the following substances with germanium will cause the germanium to emit free electrons? o a. aluminumb. indiumc. bismuthd. galliumstudent d incorrectreference7. which of the following statements about diodes and triodes is correct? a. triodes have three electrodes, whereas diodes have only a grid and a cathodeb diodes, which are often utilized as rectifiers, have two electrodes. c. adjusting the grid within a diode will have more of an effect than it will in the triode. d. diodes are often utilized as amplifiers, whereas triodes are often used as rectifiers. student c incorrect