|
|
Derive Poynting theorem from Maxwell's equations and give its
interpretation.
This question has 0 answers so far.
|
|
|
Define divergence and curl of a vector.
This question has 0 answers so far.
|
|
|
Distinguish between displacement current and conventional current.
This question has 0 answers so far.
|
|
|
Find constant a, b and c so that
V = (x + 2y + x) + (bx - 3y-z)j + (4x + cy + 2z)k is irrotational.
This question has 0 answers so far.
|
|
|
Describe the implication of Davisson-Germer experiment.
This question has 0 answers so far.
|
|
|
Why is the energy of a particle trapped inside a box quantized?
This question has 0 answers so far.
|
|
|
What are the postulates of quantum theory of radiation?
This question has 0 answers so far.
|
|
|
Copper has foc structure and the atomic radius is 0.127 nm. Find the ratio of the spacing of (111) and (123) planes.
This question has 0 answers so far.
|
|
|
Draw the planes (100), (110) and (111).
This question has 0 answers so far.
|
|
|
Define Fermi energy. What is its physical significance?
This question has 0 answers so far.
|
|
|
Derive Maxwell's equation and express it in integral form. Give the physical significance of each.
This question has 0 answers so far.
|
|
|
Write down the equation of continuity and mention its physical significance.
This question has 0 answers so far.
|
|
|
Show that in free space the direction of flow of electromagnetic energy is along the direction of wave propagation.
This question has 0 answers so far.
|
|
|
Distinguish between a boson and a fermion. Give one example each.
This question has 0 answers so far.
|
|
|
Write down the Planck's formula for the distribution of energy in spectrum of blackbody. Show that Rayleigh-Jean's law and Wein's Law are special cases of Planck's radiation law.
This question has 0 answers so far.
|
|
|
Draw a neat diagram showing the energy distribution spectra of blackbody radiation. Explain how classical theory fails to explain the spectral distribution of energy.
This question has 0 answers so far.
|
|
|
Derive Schrodinger time dependent wave equation for non-relativistic particle. Give the physical interpretation of Hamilton operator, H.
This question has 0 answers so far.
|
|
|
State the properties of wave function in a quantum mechanical system. Give one example each for an acceptable and non-acceptable wave function.
This question has 0 answers so far.
|
|
|
An electron has a speed of 2 x 10 m/s within the accuracy of 0.01%.Calculate the uncertainty in the position of the electron.
This question has 0 answers so far.
|
|
|
What do you understand by packing factor in crystals? Calculate the packing factor in the case of bcc and fcc lattices.
This question has 0 answers so far.
|
|
|
What do you mean by lattice constant? Obtain a relation between the lattice constant of a cubic crystal and the density of the crystal material.
This question has 0 answers so far.
|
|
|
Define Miller indices. If a, b, and C are the primitive vectors of the unitcell a plane of Miller indices (310) cut the crystal lattice, find the intercepts of the plane along the three axes.
This question has 0 answers so far.
|
|
|
What are Schottky and Frenkel defects? Obtain an expression for concentration of Schottky defects in a crystal.
This question has 0 answers so far.
|
|
|
Lead has foc structure and its body diagonal is 0.86 nm. When X-raysof wave length 0.71 A undergoes diffraction from (110) plane to
produce second order maxima, calculate the glancing angle.
This question has 0 answers so far.
|
|
|
What are Brillouin zones? How are they related to the energy levels of an electron in a metal?
This question has 0 answers so far.
|
|
|
Define the effective mass of electron. Obtain an expression for effective mass of an electron moving in a periodic potential.
This question has 0 answers so far.
|
|
|
Where does Fermi level lie in an n type semiconductor? Discuss the effect of temperature and doping concentration on the position of the
Fermi level in an n type semiconductor.
This question has 0 answers so far.
|
|
|
What is Hall effect? Derive an expression for Hall coefficient. Explain how the measurement of Hall coefficient helps to determine the
mobility of electron in metals.
This question has 0 answers so far.
|
|
|
The Hall voltage for the metal sodium is 0.001 mV, measured at 1 = 100mA, B=2 W/m2 and width of the specimen is 0.05 mm.
Calculate the number of carriers per cubic meter in sodium.
This question has 0 answers so far.
|
|
|
Distinguish between intrinsic and extrinsic semiconductors.
This question has 0 answers so far.
|
|
|
Write the expression of gradient in spherical coordinates.
This question has 0 answers so far.
|
|
|
Give the expression of Gauss's law for magnetic field in both differential and integral form.
This question has 0 answers so far.
|
|
|
How will the equation for Poynting theorem change for static
fields?
This question has 0 answers so far.
|
|
|
Write the expression for general wave equation. Show how it changes in case of a dielectric medium.
This question has 0 answers so far.
|
|
|
Calculate the value of wave impedance in vacuum.
This question has 0 answers so far.
|
|
|
State the significance of normalization of a wave function.
This question has 0 answers so far.
|
|
|
Are energy levels of a particle in a box equally- spaced? Show with
appropriate equation.
This question has 0 answers so far.
|
|
|
What thermodynamic statistics do electron follow, Bose-Einstein or Fermi Dirac?
This question has 0 answers so far.
|
|
|
Draw the plane in a unit cube represented by the miller indices(110).
This question has 0 answers so far.
|
|
|
A p-type semiconductor has a Hall coefficient equal to 0.0125m3/C. Find the density of charge carrier in it.
This question has 0 answers so far.
|
|
|
State Bloch Theorem.
This question has 0 answers so far.
|
|
|
Show that the trajectory of motion of a charged particle in crossed
electric and magnetic fields (constant) is a cycloid.
This question has 0 answers so far.
|
|
|
What is skin depth in electromagnetic? Does it depend upon the frequency of the electromagnetic radiation?
This question has 0 answers so far.
|
|
|
Write the Maxwell equations in differential form and state their significance.
This question has 0 answers so far.
|
|
|
Discuss continuity equation. Distinguish between conduction current and displacement current.
This question has 0 answers so far.
|
|
|
If the earth receives 20 cal/min/sq cm solar energy, what are the amplitudes of electric and magnetic fields of radiation?
This question has 1 answers so far.
|
|
|
Using the uncertainty principle show that an electron does not exist inside a nucleus.
This question has 0 answers so far.
|
|
|
Describe Davission-Germer experiment. Find the lowest energy in eV, for an electron in one dimensional box of length a =0.2nm.
This question has 0 answers so far.
|
|
|
What type of statistics shall be application for a gas of photon?Justify your answer.
This question has 0 answers so far.
|
|
|
Compare the qualitative features of Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac statistics on the basis of their functions.
This question has 0 answers so far.
|
|
|
Show that Bose Einstein, Fermi Dirac statistics reduces to Maxwell Boltzamann statistics at high temperature.
This question has 0 answers so far.
|
|
|
Chromium has structure. It has atomic radius is 0.125nm.Calculate the free volume/ unit cell.
This question has 0 answers so far.
|
|
|
Describe with a proper diagram the Unit Cell.
This question has 0 answers so far.
|
|
|
Describe with a proper diagram the Packing factor.
This question has 0 answers so far.
|
|
|
Describe with a proper diagram the Coordination Number.
This question has 0 answers so far.
|
|
|
Describe with a proper diagram the fcc.
This question has 1 answers so far.
|
|
|
Deduce the Miller indices of a plane which cuts off intercepts inthe ratio la: 3b: -2c along the three axes.
This question has 0 answers so far.
|
|
|
What is the difference between (111) and <111> for miller indices.
This question has 0 answers so far.
|
|
|
Define the Unit Cell.
This question has 0 answers so far.
|
|
|
Define the Primitive Cell.
This question has 0 answers so far.
|
|
|
Define the Primitive lattics.
This question has 0 answers so far.
|
|
|
Define the Bravis Lattice.
This question has 0 answers so far.
|
|
|
Germanium crystallizes in diamond form structure with 8 atoms per unit cell. If lattice constant is 5.62 Angstrom, calculate the density of Germanium.
This question has 0 answers so far.
|
|
|
Write short notes on Point Defect.
This question has 0 answers so far.
|
|
|
Write short notes on Frenkel Defect.
This question has 0 answers so far.
|
|
|
Write short notes on Schottky Deffect.
This question has 0 answers so far.
|
|
|
Describe Kronig-Penney Model.
This question has 0 answers so far.
|
|
|
Define law of mass action for a semiconductor.
This question has 0 answers so far.
|
|
|
How does the location of Fermi level change with doping of a semiconductor?
This question has 0 answers so far.
|
|
|
Derive the expression for Hall coefficient.
This question has 0 answers so far.
|
|
|
What are Brillouin zones?
This question has 0 answers so far.
|
|
|
Show that the Fermi energy lies midway between the conduction band and valance band for an intrinsic semiconductor.
This question has 0 answers so far.
|
|
|
Draw a graph showing the variation of the electric field, as one moves from the centre of a charged metal sphere to a point on its surface and then to a far-off outside point.
This question has 0 answers so far.
|
|
|
What is negative resistance?
This question has 0 answers so far.
|
|
|
Show that Bose Einstein and Fermi Dirac distribution function at very high temperatures go to Maxwell Boltzmann Distribution function.
This question has 0 answers so far.
|
|
|
Explain the Poynting Factor. State Poynting theorem.
This question has 0 answers so far.
|
|
|
What is magnetostriction?
This question has 0 answers so far.
|
|
|
What type of statistics shall be applicable for a gas of photons? Justify your answer.
This question has 0 answers so far.
|
|
|
Mention two property changes that occur in a material when it changes from normal to superconducting state.
This question has 0 answers so far.
|
|
|
When a charged particle of mass m and charge q enters an electric field E with a velocity v normally, show that it follows a parabolic path.
This question has 0 answers so far.
|
|
|
Show that for an electromagnetic wave in vacuum, the energy densities in electric and magnetic fields are equal.
This question has 0 answers so far.
|
|
|
Discuss the propagation of electromagnetic waves in a nonconducting medium.
This question has 0 answers so far.
|
|
|
What should be the thickness of a conducting sheet so that it can be used as electromagnetic shield? Does this thickness change with frequency?
This question has 0 answers so far.
|
|
|
Describe the construction and working of Banibridge Mass Spectrometer.
This question has 0 answers so far.
|
|
|
Describe how the single-slit experiment using an electron beam illustrates the uncertainty principle.
This question has 0 answers so far.
|
|
|
Give the properties of an acceptable wave function. Derive the stead state Schrodinger equation for a nonrelativistic particle.
This question has 0 answers so far.
|
|
|
What is meant by a distribution function? Write the expression of Maxwell-Boltzmann, Bose-Einstein and Fermi-Dirac distribution functions.
This question has 0 answers so far.
|
|
|
What is Fermi Energy? What is it physical significant?
This question has 0 answers so far.
|
|
|
Discuss the main findings of Davission-Germer Experiment.
This question has 0 answers so far.
|
|
|
Explain the working of a Zener Diode as a voltage stabilizer.
This question has 0 answers so far.
|
|
|
Why do energy bands arise in solids? Distinguish between conductors, semiconductors and insulators on the basis of band
theory.
This question has 0 answers so far.
|
|
|
Draw energy level diagrams in p- and n- type semiconductors
(a) before contact
(b) after p- and n-type semiconductors are put
together. Clearly mark the Fermi level, Acceptor level and Donor level
in both the cases.
This question has 0 answers so far.
|
|
|
Give five applications of Superconductors.
This question has 0 answers so far.
|
|
|
Write short notes on Cooper Pairs, and Zener Breakdown.
This question has 0 answers so far.
|
|
|
Write five applications of ultrasonic waves.
This question has 0 answers so far.
|
|
|
Discuss the advantages/disadvantages of using Magnetostriction method over Piezoelectric method for ultrasonic wave generation.
This question has 0 answers so far.
|
|
|
What is Moseley's law?
This question has 0 answers so far.
|
|
|
Give four applications of X-rays.
This question has 0 answers so far.
|
|
|
Describe the construction and working of Coolidge tube.
This question has 0 answers so far.
|
|
|
What is Bragg's law?
This question has 0 answers so far.
|
|
|
(b) In Newton's rings experiment, the diameters of the 6th and 14th darkrings are respectively 0.46 and 0.82 cm. What will be the diameter of
the 6th dark ring if a liquid of refractive index 1.33 is introduced
between the glass plate and lens? The radius of curvature of the
plano-convex lens is 200 cm.
This question has 0 answers so far.
|
|
|
(c) what do you mean by resolution of spectral lines? How two closely spaced spectral lines can be resolved using Michelson interferometer?
This question has 0 answers so far.
|
|
|
(a) Discuss Fraunhofer diffraction due to single slit. Deduce the condition for maxima and minima and show that the intensities of the maxima
goes on decreasing with increase in order.
This question has 0 answers so far.
|
|
|
(b) Explain Rayleigh's criterion for resolution. Calculate the least width a grating must have to resolve two components of sodium D lines in the
second order, the grating having 700 lines per cm.
This question has 0 answers so far.
|
|
|
(a) Define specific rotation. Describe the construction of Laurent's half shade polarimeter and explain how you will use it to determine the
specific rotation of cane sugar solution.
This question has 0 answers so far.
|
|
|
(b) Calculate the angle of polarization for a beam of light travelling from glass to water. The refractive index of glass is 1.5 and water is 1.33.
Also calculate the angle of refraction.
This question has 0 answers so far.
|
|
|
(a) Show that Huygen's eyepiece satisfies the condition of minimum spherical and chromatic aberration.
This question has 0 answers so far.
|
|
|
(b) Explain the term cardinal points for a coaxial lens system. Find the cardinal points of Ramsden's eyepiece.
This question has 0 answers so far.
|
|
|
(c) Explain the working principle of an Electron microscope.
This question has 0 answers so far.
|
|
|
(a) What are Einstein's A and B coefficients? Obtain a relation between them and discuss in brief their physical significance.
This question has 0 answers so far.
|
|
|
(b) What are the essential conditions for laser action to take place?
This question has 0 answers so far.
|
|
|
(c) With the help of a neat energy level diagram, show the lase rtransitions in He-Ne-laser.
This question has 0 answers so far.
|
|
|
(a) Deduce an expression for numerical aperture of an optical fibre. Explain acceptance angle and acceptance cone.
This question has 0 answers so far.
|
|
|
(b) The numerical aperture of an optical fibre is 0.54. A ray entering the fibre with an angle of 34o with the fibre axis will be transmitted
successfully or not? Why?
This question has 0 answers so far.
|
|
|
(c) What do you mean by modes of propagation? Which type of fibre is best for long distance communication?
This question has 0 answers so far.
|
|
|
(a) Explain the negative result of Michelson-Morley experiment. How the negative result was interpreted?
This question has 0 answers so far.
|
|
|
(b) Derive Lorentz transformation equations and use them to prove that no material particle can attain a velocity greater than the velocity of
light.
This question has 0 answers so far.
|
|
|
(c) Calculate the percentage contraction in the length of a rod moving with a speed of 0.8c in a direction at angle 45o with its own length.
This question has 0 answers so far.
|
|
|
(a) Show that the angular momentum of a particle moving under the influence of central force is constant.
This question has 0 answers so far.
|
|
|
(b) Define the terms logarithmic decrement and quality factor of a damped harmonic oscillator. Obtain an expression for them.
This question has 0 answers so far.
|
|
|
(c) Discuss the sharpness of resonance in case of a forced oscillator.Explain the effect of damping on it.
This question has 0 answers so far.
|
|
|
Attempt the following: (a) What are the conditions to obtain sustained interference pattern with
good contrast?
This question has 0 answers so far.
|
|
|
Attempt the following: (b) Why interference fringes are observed in case of thin films not in the case of thick films?
This question has 0 answers so far.
|
|
|
Attempt the following: (c) How many secondary maxima and minima are formed between any two principal maxima, if a grating of 1000 lines is used?
This question has 0 answers so far.
|
|
|
Attempt the following: (d) How many orders will be visible if the wavelength of incident radiation is 6000 4 and the number of lines on the grating is 12000 per inch?
This question has 0 answers so far.
|
|
|
Attempt the following: (e) What is the main limitation of a Nicol prism?
This question has 0 answers so far.
|
|
|
Attempt the following: (f) Calculate the thickness of quartz required for making a half wave plate for wavelength,  = 5800 OA. The refractive indices of ordinary and extraordinary rays are 1.544 and 1.553 respectively.
This question has 0 answers so far.
|
|
|
.Attempt the following: (g) Is two level laser possible? Justify your answer
This question has 0 answers so far.
|
|
|
.Attempt the following: (h) What is the significance of V-number in optical fibre?
This question has 0 answers so far.
|
|
|
.Attempt the following: (i) What are massless particle?
This question has 0 answers so far.
|
|
|
.
Attempt the following: (j) Differentiate between conservative and non-conservative forces. Give one example each. .
This question has 0 answers so far.
|
|
|
(a) Explain what will happen to the Newton's rings observed in reflected system when. (i) Few drops of water is introduced between the glass plate and the
plano-convex lens.
(ii) The plano-convex lens is lifted up slowly by a distance  /2.
This question has 0 answers so far.
|
