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- How many valence electrons are generally contained in materials used for insulators?What is a proton? Where does it normally exist in an atom, and what is its charge?The 0.6 m rod of a metal elongates 0.67 mm on heating from 35 to 90 C. Determine the value of the linear coefficient of thermal expansion for .this material
- 2. When a current of 1A flows through a wire, the drift velocity of the electrons is 0.9 mm/s. What will be the drift velocity of the electrons when a 2A current flows through another wire of the same material having double the length and double the area of cross section and same temperature.A piece of silver wire has a resistance of 1 ohm. Determine the resistance of alead wire one-third the length and one-third the diameter if the resistivity of lead wire is 30 times that of silver. NOTE: Please explain where did you get the variables so I can understand them. Thank youAt what temperature will intrinsic silicon become an insulator, based on the definitions in Table ? Assume that μn = 1800 cm2/V·s and μp = 700 cm2/V·s.
- A copper wire has a diameter of 2.05 mm and carries a current of 15 A due solely toelectrons. (These values are common in residential wiring.) Each electron has a charge of -1.60 x 10-19 C. Assume that the free-electron (these are the electrons capable of movingthrough the copper) concentration in copper is 1029 electrons/m³. Find the average velocity ofthe electrons in the wire.P1.15. A copper wire has a diameter of 2.05 mm and carries a current of 15 A due solely to clectrons. (These values are common in residential wiring.) Each electron has a charge of -1.60 × 10-19 C. Assume that the free-electron (these are the electrons capable of moving through the copper) concentration in copper is 1029 electrons/m'. Find the average velocity of the electrons in the wire.Assume that the conductivity of a pure semiconductor at an applied electric field of 450 mV/m is 2.75 X 1013/2-cm. Given that the drift velocity of electrons is 0.135 m/s and that of holes is 0.048 m/s, determine the density of the charge carriers per cubic meter in this material.
- An element has electrical conductivity (0)= 6.8 5 -1 -1 ×10 Ohm .cm and number of charge tn_₂) = 3 5.58×10 electron /cm. Calculate the mobility of an electron in this materials. 3 carriers in cm 2315. Which of the following is TRUE? a. A conductor has a large amount of energy gap between conduction band and valance band b. A semi-conductor material does not allow the flow of electrons at all time. c. A good insulator material has 8 valance electrons d. A good conductor material has 3 valance electrons.1. A Germanium sample is 5 mm long and has a rectangular cross-section, 50 μm by 150 μm. A Phosphorus atom with concentration of 4.4 x 10¹5/cm³ at 300 K is added and corresponds to one impurity atom for 107 Ge atoms. A steady current of 3 juA exists in the bar. a. Set up the equations for concentrations, conductivity, resistance, and voltage. b. Solve for the electron and hole concentration, conductivity, resistance, and voltage. 2. A basic junction diode is operating at a room temperature of 25°C and has a reverse current of 1 nA. a. Set up the different diode equations. b. Solve for the diode current at room temperature, reverse current, and threshold voltage when the temperature becomes 72°C.