The electron drift mobility of a pure metal is 10 cm2 V-1 s-1 and its resistivity is 110-7 Ω m. The metal’s atomic mass is 100 g mol-1 and its density is 10 g cm-3.
a. What is the charge carrier density (electrons/m3)?
b. What is the atomic density (atoms/m3)?
c. How many free electrons are donated by each metal atom?
The electron drift mobility of a pure metal is 10 cm2 V-1 s-1 and its resistivity...
Question 8 Pure silicon at room temperature has an electron number density of about 5 × 1015 m3 and an equal density of holes In the valence band. Suppose that one of every 10° silicon atoms is replaced by a phosphorus atom. (a) Which type will the doped semiconductor be, n or p? (b) What charge carrier number density will the phosphorus add? (c) What is the ratio of the charge carrier number density (electrons in the conduction band and...
A 2.5 g wire has a density of 15.4 g/cm3 and a resistivity of 1.22 × 10−7 Ω · m . The wire has a resistance of 106 Ω . How long is the wire? Answer in units of m. The wire is made up of atoms with molecular mass 22 g/mol. What is the drift speed of the electrons when there is a voltage drop of 201.4 V across the wire? Assume there is one conduction electron per atom....
11. An aluminum wire with a square cross-section 2 mm on a side is carrying a current of 1.5 amps. Aluminum has a resistivity of 2.69 x 10* ohm-cm and an atormic volume of 10 cc/mol. Assuming aluminum has three free electrons per atom, calculate the (a) Hall coeffcient, (b) electron mobility, (c) drift velocity, d) collision time. (e) electric field, (f) power dissipated (heat generated) per cm length, and (g) the Hall voltage across the wire in a transverse...
all of 8 please.
8. An aluminum wire carrying a current of 5 A has a cross sectional area of 4 x 10'6 m2. Find the drift speed of the electrons in the wire. The density of aluminum is 2.7 g/cm3. (Assume three electrons are supplied by each atom). a) Recall the mass flow rate equation from semester 1. Rms Ro v b) Write the equivalent current relation for charges in a wire, I- c) What is the electrical analogy...
1. An aluminum wire having a cross-sectional area equal to 3.50 10-6 m2 carries a current of 6.50 A. The density of aluminum is 2.70 g/cm3. Assume each aluminum atom supplies one conduction electron per atom. Find the drift speed of the electrons in the wire. 0.000193452 Incorrect: Your answer is incorrect. The equation for the drift velocity includes the number of charge carriers per volume, which in this case is equal to the number of atoms per volume. How...
13. The resistivity of aluminum at 25 'C has been measured to be 2.72 x 10-8 0 m. The thermal coefficient of resistivity of aluminum at 0 C is 4.29 x 10-3 K-1. Aluminum has a valency of 3, a density of 2.70 g cm3, and an atomic mass of 27 a. Calculate the resistivity of aluminum at-40°С. (Ans: 2.03 x 103 Ω m) b. What is the thermal coefficient of resistivity at-40'C? (Ans: 5.23x 103K c. Estimate the mean...
3. (20 points) The resistivity of aluminum at 0'C has been measured to be 2.46 x 10-82m The thermal coefficient of resistivity of aluminum at -40°C is 5.18 x 10-8K-1. Aluminum has a valency of 3, a density of 2.70g cm-3, and an atomic mass of 27. Answer the following questions: (a). Calculate the resistivity of aluminum at 25 C (b). What is the thermal coefficient of resistivity of aluminum at 25'C? (c). Estimate the mean free time between collisions...
Please make sure to answer part b.ii Mobility and Drift a) For some resistor applications, it is important to maintain a fixed value of resistance over a range of operating temperatures. Explain briefly how you could minimize variations (resulting from changes in temperature) in the resistivity of Si at temperatures near 300K. Assume that you are free to choose the value of resistivity. b) A (non-compensated) p-type silicon sample is maintained at room temperature. When an electric field with a...
1-One-half of an electrochemical cell consists of a pure Zinc electrode in a solution of Zn2+ ions; the other half is a Lead electrode immersed in a solution of Pb2+ solution. The half-cell potentials for Zinc and Lead are -0.763 V and -0.126 V, respectively. (a) If the cell is a standard one, write the spontaneous overall reaction and calculate the voltage that is generated. (b) Compute the cell potential at 25oC if the Zn2+ and Pb2+ concentrations are 10-2...
7. Two light bulbs with ratings of 40 W and 100 W are plugged into sockets supplying 110 V. A) Calculate the resistance of each. Which has more resistance? The more resistance. (Notice that voltage is fixed) W bulb has B) If the 100 W bulb is operated continuously for 2 full days and electric energy costs $0.12 per kWh, how much does it cost? Convert W to kW multiply by the number of hours to get kW.h multiply by...