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- What is Fermi Deric probability of level above of Fermi level by 0.25 ev if temperature is 289^0A Ge diode carries a current of 1 mA at room temperature when forwardbias of .15 V is applied. Estimate the reverse saturation current at roomtemperature.A solution of LICI at a concentration of 0.01 Mis contained in s tube harving a. Cáross-sectional area of 5 èm. The fimiting molar ionic conductivities of Li" and CT are 38.6 and 76.4 '.cm.mole. Calcnlate the speeds of L* and Cr ions if a current of 1 A is passed.
- Calculate the transistor collector current if it is driven by a small base current of 7mA with a Emitter current of 10mA?Calculate the In composition for the alloy InGaN which have a band gap needed to produce blue light andredlight emission (ignore quantum or strain effects).a metal is heated, its atoms vibrate more when about their position in the lattice (a netuons of crossed burs) This Causes them to take up more Space, so the solid metal expands from its original shape. calculate the heat needed to expand a ring made of copper internal diameter of Somm to fit over a Shaft of with an diameter So.05mm. The shaft is measured at a temp 182
- QIFind Fermi probability of level above of Fermi level by 0.28ev and temperature in degree is 5001) An abrupt Si p-n" junction of cross sectional area 10 cm' is operated at 300K and has the following properties: p-side: N. = 10" cm ', T, = 10 us; n-side: N, » N,. a) Calculate the built-in potential. Hint: use half the band gap energy for the Fermi level shift for the n-side. b) Calculate the junction width at a reverse bias of 20 V. c) Calculate the peak electric field at a reverse bias of 20 V. d) Calculate the junction capacitance at a reverse bias of 20 V. e) Calculate the excess electron concentration on the p-side of the depletion zone An = npo (ext – 1) at a forward bias of 0.7643 V. ) Calculate the stored electron charge due to the electron diffusion current on the p side of the junction at the forward bias of part e (forward current 20 mA). The calculation of part (f) can be done by integrating the minority charge density on the p-side, Q = -qA S" An e-x/hn dx.Calculate the Fermi energy, Fermi wavevector, Fermi velocity and Fermi temperatureof Zinc. Given that the density of zinc is 7.13×103kg/m3, its atomic weight is 65.4 amu.and 1 amu = 1.67×10-27 kg.
- Question 5. A pure resistive R ohm output is connected to the output of the three-phase Bridge Rectifier.resistor is connected and provides 250 DC output voltage, 50A load current,frequency is 50 Hertz.(d) TU Value(e) Reverse Peak Voltage (PIV) of each diode(f) Find the maximum value of the current flowing through the diode.How to draw fermi surfaces ?11.1 Give numerical estimates for the Fermi energy of (a) electrons in a typical metal; (b) nucleons in a heavy nucleus; (c) He' atoms in liquid He' (atomic volume particles as free particles. 46.2 Å /atom). Treat all the mentioned %3D