The direct lattice vectors for a lattice are given by:
See Answer →A crystal of iridium is irradiated by x-rays with a wavelength of 0.721 Å. Calculate the angle of reflection from the (111) plane, given that the lattice constant of iridium is 3.84 Å.
See Answer →Determine the boundaries of the first Brillouin zone of a bcc structure with a lattice constant 0.20 nm
See Answer →Calculate the volume of the unit cell for fcc Pb given that its atomic radius is 0.175 nm.
See Answer →In crystal growth why does the nucleation process become more stable as the size of the nucleus increases?
See Answer →Distinguish between substitutional and interstitial impurities with the help of a diagram.
See Answer →Distinguish between substitutional and interstitial impurities with the help of a diagram.
See Answer →How does the Fermi energy of n- and p- type semiconductors change with dopant concentration?
See Answer →Show that the group velocity is zero at the zone boundary for a linear diatomic chain.
See Answer →Plot the variation of electrical resistivity with temperature for an ideal metal and a superconductor.
See Answer →The energy of the lowest allowed level for an electron in a 1-D box is 8.0 eV. Can the electron ever have an energy of 200 eV? Justify.
See Answer →List the symmetries observed in a methane molecule.
See Answer →Write down the electronic configuration of the Ge atom. What type of bonding would you expect to find in Ge?
See Answer →Is it possible to carry out electron diffraction studies in air? Explain.
See Answer →Write down the Miller indices of a set of parallel planes which make intercepts in the ratio of 4a1:4a2 on the x and y axes and are parallel to the z-axes.
See Answer →a) The earth and the sun are 8.3 light-minutes apart in the same inertial frame. Two events occur at t = 0 on the earth and t = 3 minutes on the sun respectively. Calculate the time difference between the events according to an observer moving at u = 0.6c from the earth to the sun. (1 light minute is the distance travelled by light in one minute.)
See Answer →c) Using the expression of Bose-Einstein distribution function for photons
derive Plancks Law and show that (i) Rayleigh-Jeans Law, and (ii) Wien’s Law follow from it at low & high frequencies.
See Answer →Design a 5-bit DAC using op-amp adder. Specify the minimum op-amp supply voltage required for proper operation. Calculate the step size for digital input of 0-5 V. What is % resolution of the DAC?
See Answer →Convert 732.5210 into its octal equivalent.
See Answer →