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(a) Adding dopants to a sample of silicon is found to reduce the Hall coefficient by a factor of 10 and increase the conductivity by a factor of 5. What effect has this dopant addition had on the mean free path?
(b) In a Hall experiment with a transverse magnetic field of 20 tesla, the total electric field is at angle 20o to the current. Assuming the charge carriers to be electrons, what is their collision time?
(c) If you doubled the width of a Hall sample but kept J and B the same, how would that affect the Hall field? the Hall voltage? the net charge density along the edges?
A source X produces symbols A, B, C, D, and E with probabilities 0.5, 0.25, 0.125, 0.0625 and 0.0625 (a) Find the information content of X. (b) Give a fixed length code for X. Compute its efficiency. (c) Derive a Huffman code for X
A U manometer reads 20 cm air as operating fluid and a given manometric fluid. A single branch closed tube reads 35 cm connected to point 1. If P2 = 1.2 ATM calculate the pressure in point 1 and the density of the manometric fluid.
Design the electrical system for a shopping center with 500,000 square feet at least 30 spaces of three different sizes (5,000, 10,000 and 25,000 sf). They may be offices, banks, restaurants and shops.
A small magnetic needle, which is free to turn slowly in a horizontal plane, is placed at the center of the coil in question (6). Show that it will set at an angle \(\phi\) to B where \(cot(\phi) = 4R/(\pi n^2 \mu_{o}\omega a)\)
An intergrated circuit temperature probe is rated at 0-10 volts dc over a 0-175 degrees Celsius range. What is the temperture when the output voltage is 3.65 volts dc
1. Express the Boolean function f(X,Y,Z) = XY + X(Y + Z) in sum of products form showing the sum all nonzero minterms. 2. Express the Boolean function f(A,B,C,D) = A(B + BC) + ACD in sum of products form showing the sum all nonzero minterms.
For much of the last century, the annual growth rate of energy utilization in the world was 3.5% per year. At present, the rate of global energy usage is approximately 15 TW. When considering only coal, oil, and gas.
A student project is required to be portable and hand held. It requires 6 V DC power at a current of 150 mA. The batteries for the power supply must last for a minimum of 7 hours of continuous operation.
If you have 16 kibibytes of memory plus a few (less than 10) memory mapped devices (assume that each device uses 16 bytes of address space), what should the address size be
A sample of non-ideal gas is made to undergo an expansion process during which its pressure and volume are related as shown in the table below. The energy of the gas at the start and finish of the process is measured and found to be 5 and 3.2 Btu
A three-phase load is Y-connected. The load has a phase voltage of 139 V and a phase current of 49 A. Each phase of the load consumes 5.1 kW of power. (A) Sketch and label the load. Find (b) the line voltage, (c) the line current, and
What is the clearance requirement for a 120/240 V, single-phase, three-wire service at the point of attachment to the building Over the driveway Over the main roadway
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