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Prove that the Fermi level lies exactly at the centre of the forbidden energy gap in case of an intrinsic semiconductor. OR Derive an expression for Fermi level for an intrinsic semiconductor.
engineering physics updated 21 months ago by sagarkolekar ★ 11k
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Distinguish between Type I and Type II superconductor.
engineering physics updated 4.5 years ago by teamques10 ★ 67k
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Show that for intrinsic semiconductors the Fermi level lies midway between the conduction band and the valence band. Draw the energy level diagram as a function of temperature for n-type of semi-c
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Explain ionic polarization and obtain polarizability
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Explain with neat diagram construction of Braggs X-ray spectrometer. Write the procedure to determine crystal structure.
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Explain the origin of electronic, ionic and orientational polarization and temperature dependence of respective polarizability.
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Obtain the expression for the n th dark ring in Newton`s ring experiment. Hence explain a Suitable way to calculate refractive index of a liquid using same set up.
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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How many orders will be observed by grating having 4000 lines/cm, if it is illuminated by light of wavelength in the range 5000 to 7500 $\mathring{A}$?
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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What are different types of pumping and pumping schemes. Why four level pumping schemes is superior to three level. Why two-level pumping scheme is not suitable?
engineering physics updated 2.7 years ago by sagarkolekar ★ 11k
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White light falls normally on a soap film of thickness $5 \times 10^{-5}$ cm & of RI 1.33. Which wavelength in the visible region will be reflected most strongly?
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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Explain Crystal Imperfection.
engineering physics updated 5.3 years ago by teamques10 ★ 67k
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What is magnetic circuit? Explain Ohm's law in case of magnetic circuit.
engineering physics updated 6.7 years ago by teamques10 ★ 67k
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Fringes of equal thickness are observed in a thin glass wedge of RI = 1.52. Calculate the angle of wedge in arc-sec if for a light of $\lambda =5893 \mathring{A}$ the fringe spacing is found to be 1mm
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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Explain Diamond crystal structure with proper diagram and determine its APF?
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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What is Hall Effect? Mention its significance. How mobility can be determined by using Hall Effect?
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Find the Miller indices of a set of parallel planes which makes intercepts in the ratio 3a:4b on the X and Y axes and parallel to Z-axis.
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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What is dielectric polarization and dielectric susceptibility? Find the relation between them.
engineering physics updated 8.2 years ago by teamques10 ★ 67k
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Draw the I-V characteristics of a photo -diode. What is meant by dark current?
engineering physics updated 4.5 years ago by teamques10 ★ 67k
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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 8.2 years ago by teamques10 ★ 67k
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Prove that internal energy is a property of the system.
engineering physics updated 2.8 years ago by Krishna_Agrawal • 2.7k
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Zn has HCP structure. The nearest neighbor distance is 0.27nm. The atomic weight of Zn is 65.37. Calculate the volume of unit cell, density and atomic packing fraction of Zn.
engineering physics updated 7.8 years ago by teamques10 ★ 67k
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What is working principle of SQUID ? Explain how it is used to detect the magnetic field?
engineering physics updated 4.5 years ago by teamques10 ★ 67k
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Find the natural frequency of vibration of quartz plate of thickness 2mm
engineering physics updated 2.2 years ago by sagarkolekar ★ 11k
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What will be effect on diffraction pattern of grating if i) the number of lines in grating is increased. ii) grating element is of the order of a wavelength or less iii) if the rulings are
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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In Newtons ring experiment, if observed in reflected light, is it possible to obtain bright spot at center? If a light of red color is used first and then a blue light, which set of rings would have
engineering physics updated 2.7 years ago by pedsangini276 • 4.8k
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