23. The nucleus of an atom is made up to a. Proton and neutrons b. Electrons and protons c. Electrons d. Electrons and protons 24. The atomic number of silicon is а. 8 b. 14 c. 4 d. 2 25. The atomic number of germanium is а. 32 b. 4 с. 2 d. 8 26. The valence shell in a silicon atom has the number designation of а. 1 b. О с. 3 d. 2 27. Valence electrons are a. In the closet orbit to the nudeus b. In various orbits around the nucleus c. In the most distant orbit from the nucleus d. Not associated with a particular atom 28. A positive ion is formed when a. There are more holes than electrons in the outer orbit b. Two atoms bond together c. A valence electron breaks away from the atom d. An atom gains extra valence electron 29. The most widely used semi-conductive material in electronic device is a. Silicon b. Carbon c. Germanium d. Copper 30. The energy band in which free electrons exist is the a. First band b. Conduction band c. Second band d. Valence band 31. Electron-holes pairs are produced by a. Ionization b. Thermal energy c. Recombination d. Doping

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Analog to Digital Converters

The analog-to-digital converter (ADC) allows circuits controlled by microprocessors, Arduinos, Raspberry Pi, and various reasonable digital circuits to be connected to the real world. In the real world, analog signals have a continuous stream of information from a variety of sources and sensors capable of measuring sound, light, temperature, or movement, in addition to the many digital systems that interact with their environment by measuring analog signals from those transducers.