In a time-of-flight experiment, electron transit time was t₁ and 1₂ under the bias voltage of V₁ and V2, respectively. The thickness of the n-type silicon between the front and back electrode is w. Express the electron mobility in terms of these parameters. It is given that vax = −µcFx. dx
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- Problems Q1: Calculate electrons and holes concentration in a germanium sample If T=300 K, Na-5×10¹%/m³, N₁-0. Assume that n=2.4×10¹⁹/m³. (Ans: 5.97×10¹⁹/m³, 9.65×10¹8/m³)Problems Q1: Calculate the drift current density in silicon sample. If T=300 K, N=102/m*, Na=102/m’V, un=0.85m’/V.s, Up=0.04m/V.s, E=35 V/cm.. (Ans: 6.8×104A/m²).Q:: A Si sample is doped with 107 cm3 As. What is the equilibrium hole concentration at 300 k? and where is Ep relative to E,? Take n = 1.5 x 1010 cm-. (Ans. 2.25 x 10'cm,0.407ev).
- The relation between resistance R and temperature T for a thermistor (a device that measures temperature) closely follows R = Ro e[Beta (1/T - 1/To)] where R is the resistance in ohms measured at temperature K, and Beta is a material constant. What are the units of Beta and Ro? Clearly show how you decided on your answer.6.29. Find the number of conduction electrons in a l-meter cube of copper if o= 58 MS/m and u- 3.2 x 10m/V .s. On the average, how many clectrons is this per atom? The atomic weight is 63.54 and the density is 8.96 x 10 kg/m'. Ans. 1.13 x 10, 1.336V ol +T;> T The output signal given above is taken from a circuit with the frequency of the input signal 100 Hz, the capacity of the capacitor used is 4µF, and the value of the ripple factor is 1.21. Answer the following questions using the ones given. The diodes used are silicon diodes, their operating voltages are 0.7 volts, and can be omitted because their resistance is very small. a) Write down the purpose of the circuit that will give the output signal above. b) Calculate the effective value of Ripple voltage V_rms for this circuit
- The Type K thermocouple has a sensitivity of about 41 micro-Volts/℃, i.e. for each degree difference in the junction temperature, the output changes by 41 micro-Volts. If you have a 32-bit ADC, what is the smallest temperature change you can detect if the ADC range is 10 V? Try leaving the answer as a decimal with significant digits: e.g., 0.00004100.A water sample was analyzed by an .15 emission spectroscopic method (slope of the calibration graph = 5.1 ppm Zinc-1). If the average signal of this sample is 18.3(±0.2), then the analytical sensitivity of * :this sample is %3D 11.4 33.8 25.5 19.4Check Your Understanding If a=3+4i , what is the product a* a?
- Question: Suppose we consider a one-dimensional chain of links, where each link (with volume dV) has a probability to fail of 0.1%. What is the probability of failure for a chain with 1000 links (i.e. volume 1000 dV)? Give your answer in 3 significant figures. Answer: %Given the sample data {1, 2, 3, 2, 7} (a) Calculate the mean.The number of silicon atoms per m3 is 5 × 1028. This is doped simultaneously with 5 × 1022 atoms per m3 of Arsenic and 5 × 1020 per m3 atoms of Indium. Calculate the number of electrons and holes. Given that ni = 1.5 × 1016 m-3. Is the material n-type or p-type?