Ask Question, Ask an Expert


Ask Physics Expert

problem 1: Answer in short:

a) List out the rotational symmetry axes in a face centered orthorhombic crystal system.

b) Draw the first Brillouin zone for a 2-D oblique reciprocal lattice.

c) Why are X-rays with energies ∼ few keV needed to probe crystal structures by diffraction methods?

d) describe the bonding method in hydrogen fluoride (HF).

e) Compute the group velocity and phase velocity of a longitudinal wave propagating all along a linear monoatomic chain, if its frequency is ω = √K/M where m is the mass of the atom and K is the force constant.

f) What is the importance of Debye frequency?

g) Compute the fraction of electrons excited above the Fermi level in Al at room temperature, given that the Fermi energy of Al is 11.1 eV.

h) Describe why the resistivity of a semiconductor reduces with increasing temperature.

i) Differentiate between Type I and Type II superconductors.

j) What are the uses of photo-conducting materials?

problem 2:

a) The primitive translation vectors of the hexagonal space lattice are given by:

840_primitive translation vectors.jpg

Find out the volume of the primitive cell and the reciprocal lattice vectors.

b) Obtain the structure factor for Na and CsCl both of which form a bcc lattice.

c) List out the symmetries of the CH3OH molecule.

d) Find out the radius of the largest sphere that can be fitted in the centre of a mono atomic fcc unit cell.

problem 3:

a) Compute the equilibrium lattice energy per mole of NaCl that has a lattice constant a = 5.63 Å, n = 8.4 and a Madelung constant of 1.748. (Take ε0 = 8.85 × 10−12 Farad m−1.)

b) Compute the heat capacity of Hf at 200 K, given that its Debye temperature is 242 K.

c) The interatomic spacing of a 1D lattice of atoms of mass 5.0 × 10−27 kg is 4.0 Å. The force constant is 2.0 × 10−2 Nm−1.

Compute the maximum frequency that can be supported by this lattice.

d) The longitudinal and transverse velocities in nickel all along the [100] direction are 5.30 km s−1 and 3.65 km s−1, correspondingly. The transverse velocity in the [110] direction is 2.26 km s−1. The density of nickel is 8.90 g cm−3. Compute all the independent elastic stiffness constants.

problem 4:

a) Compute the Fermi energy of a monovalent bcc solid whose lattice constant is 5.1Å.

b) Find out the energy and momentum of an electron at the boundary of the first Brillouin zone of a square lattice with a side of 3.0 Å.

c) Find out the change in the Femi level of GaAs as the temperature changes from 0 K to 300 K. The band gap Eg =1.42 eV and the effective mass of the electron and hole are 0.068 me and 0.56 me correspondingly.

d) Compute the superconducting transition temperature of a substance for which the critical fields at 14 K and 13 K are 1.4 × 105 T and 4.2 × 105 T correspondingly.

problem 5:

a) Compute the molar diamagnetic susceptibility for Li in its ground (1s) state.

b) describe the technique used to grow crystals of the compound semiconductor GaAs.

c) describe the various kinds of polymerization processes with an illustration of each.

d) Describe the properties of thin film materials and their subsequent applications.   

Physics, Academics

  • Category:- Physics
  • Reference No.:- M92529
  • Price:- $70

Priced at Now at $70, Verified Solution

Have any Question? 

Related Questions in Physics

1 ip coasting due west on your bicycle at 77 ms you

1. IP Coasting due west on your bicycle at 7.7 m/s , you encounter a sandy patch of road 7.7 m across. When you leave the sandy patch your speed has been reduced by 2.0 m/s to 5.7 m/s . a. Assuming the sand causes a cons ...

Suppose that a stop-and-wait arq system has a time-out

Suppose that a Stop-and-Wait ARQ system has a time-out value that is less than the time required to receive an acknowledgment. Sketch the sequence of frame exchanges that transpire between two stations when station A sen ...

Two displacement vectors a and b with ab being 570 m

Two displacement vectors A and B, with A+B being 57.0 m, 25.0A?° north of east, and A-B being 33.0 m, 35.0A?° west of south. Find the components of A and B.

A 62 newton force is applied to a gear wheel that has a 1

A 62 Newton force is applied to a gear wheel that has a 1 yard radius. Determine the torque applied to the gear wheel in foot pounds

An electric motor running on a 120 v receptacle is drawing

An electric motor running on a 120. V receptacle is drawing 9.00 amperes of current. What is the motor's power? Express your answer in both watts and horsepower.

A moveable bin and its contents have a combined weight of 3

A moveable bin and its contents have a combined weight of 3 kN. Determine the shortest chain sling ACB that can be used to lift the loaded bin if the tension in the chain is not to exceed 5.6 kN.

A student performs a kinetic experiment on the first-order

A Student performs a kinetic experiment on the first-order kinetics of the reaction: N 2 O 4  -> 2NO + O 2 . She calculates the first-order rate constant k= 0.750 s -1  and the following data: intitial mass of N 2 O 4 : ...

A simply supported beam has a concentrated downward force p

A simply supported beam has a concentrated downward force P at a distance of a from the left support, as shown in the figure below. The flexural rigidity EI is constant. Find the equation of the Elastic curve by successi ...

A volumetric percentage of the propane liquid phase left

(a) volumetric percentage of the propane liquid phase left the cylinder (b) Mass fraction of liquid propane in the cylinder (c) What’s the volume of the cylinder excluding propane... Imagine that with propane is a bulk v ...

Consider an ideal n-channel mosfet with a width-to-length

Consider an ideal n-channel MOSFET with a width-to-length ratio of (W/L) = 10, an electron mobility of µ n = 400 cm 2 /V-s, an oxide thickness of t ox = 475 Å, and a threshold voltage of V T = +0.65 V. (a) Determine the ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

A cola-dispensing machine is set to dispense 9 ounces of

A cola-dispensing machine is set to dispense 9 ounces of cola per cup, with a standard deviation of 1.0 ounce. The manuf

What is marketingbullwhat is marketing think back to your

What is Marketing? • "What is marketing"? Think back to your impressions before you started this class versus how you

Question -your client david smith runs a small it

QUESTION - Your client, David Smith runs a small IT consulting business specialising in computer software and techno

Inspection of a random sample of 22 aircraft showed that 15

Inspection of a random sample of 22 aircraft showed that 15 needed repairs to fix a wiring problem that might compromise

Effective hrmquestionhow can an effective hrm system help

Effective HRM Question How can an effective HRM system help facilitate the achievement of an organization's strate