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Fermi Energy for silver is 5-5eV. Find out energy for which the probability of occupancy at 300 K is 0.9.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Explain piezoelectric oscillator to produce USW?
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Describe the formation of energy band in solid? Explain how it helps to classify the solids on to conductors, insulators and semiconductors with proper diagram.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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What is Fermi level and Fermi energy? Write the Fermi-Dirac distribution function.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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What is Fermi level in semiconductor? Show that in intrinsic semiconductor Fermi level is always at the middle between the forbidden energy gaps.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Explain the formation of depletion region in p-n junction.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Calculate its intrinsic carrier density.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Explain Hall Effect in metal. Derive the formulae to determine the density and mobility of electrons.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Determine the current through the bar and the voltage between the Hall electrodes placed across the short dimensions of the bar.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Define drift current, diffusion current and mobility of charge carriers.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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How a p-n junction diode is used to generate a potential difference in a photovoltaic solar cell. OR Explain the use of p-n junction as a solar cell.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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In an n type semiconductor the Fermi level lies 0.4 eV below conduction band. If the concentration of donor atom is doubled, find the new position of the Fermi level w.r.t. the conduction band.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Draw the energy level diagram to show the effect of (i) Temperature (ii) Impurity atom concentration in low range (iii) Impurity atom concentration in high range.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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8. Draw the energy band diagram of an unbiased p-n junction and mark the barrier potential and depletion region.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Fermi level in K is 2.1 eV. What are the energies for which the probability of occupancy at 300K is 0.99 and 0.01?
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Explain construction and working of a solar cell.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Explain the formation of energy bands in solids. With neat energy band diagrams explain extrinsic semiconductors.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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What would be the resistivity of P-type silicon
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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What is the probability of an electron being thermally excited to conduction band in silicon at 200C. The band gap energy is 1.12eV. Boltzmann constant is 1.38 x 10^-23 J/K.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Define the term space lattice, unit cell and lattice parameter.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Calculate the number of atoms per unit cell of a metal
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Discuss Diamond structure with neat diagram and also determine the effective number ofatoms/unit cell, co-ordination number and atomic radius in terms of lattice constant.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Derive Braggs law & X-rays of unknown wavelength give first order Bragg's reflection at glancing angle of 20" with (2 1 2) planes of copper having FCC structure.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Cu has FCC structure. If the interplanar spacing d is 2.08 A" for the set of (1 1 1) planes. Find the density and diameter of Cu atom. Given atomic weight of Cu is 63.54.
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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Draw the following in a cubic unit cell (0 1 2), (1 2 3), [1, 2 1].
engineering physics updated 8.4 years ago by teamques10 ★ 68k
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