Ask Question, Ask an Expert


Ask Physics Expert

problem 1: Answer the following problem in brief:

a) Can a unit cell in the shape of a pentagon make a two dimension crystal lattice? Describe.

b) Find out the volume of the primitive cell of a bcc lattice.

c) Is it possible to carry out electron diffraction studies in air? Validate.

d) Describe why diamond crystals have a regular tetrahedron structure.

e) Find out the velocity of a longitudinal wave all along the x-direction for which the particle displacement is represented by u1 = u0 exp [i (k x − ω0t)].

f) How does the linear monoatomic chain of atoms act like a low pass filter?

g) Sketch the first and second Brillouin zone for a 2-d square lattice.

h) What is the consequence of lowering the dopant concentration on the Fermi energy and carrier concentration of an n -type semiconductor?

i) Differentiate between substitutional and interstitial impurities with the help of a diagram.

j) Enlist the factors which find out the power available from a photovoltaic device.

problem 2:

a) Nb has a density of 8.57 g cm−3, a lattice constant of 4.05 Å and an atomic weight of 92.91 u. Find out the number of atoms per unit cell of Nb and predict its crystal structure.

b) Aluminium which crystallizes in c structure has an atomic radius of 1.43 Å. Find out the distance between its (100) and (111) planes.

c) Find out the boundaries of the first Brillouin zone for Chromium that has a bcc crystal structure and a lattice constant of 2.88 Å.

d) The values of 2d for three different diffracting crystals are 25.757Å, 8.742Å and 4.027Å.  By using Bragg’s Law, find out which of such crystals must be used to measure the intensities of X-rays for which λ = 1.937 Å, given that the optimal range of 2θ for each crystal lies between 30° - 130 °.

problem 3:

a) Compute the closest neighbor distance for CeCl given that its lattice energy is 652 kJ mol−1, its Madelung constant is 1.763 and its repulsive exponent is 10.6.

(Take ε0 = 8.86 × 10−12 Farad m−1).

b) The elastic stiffness constants for Ag are as shown below:

C11 = 1.24 × 1011 Nm−2; C44 = 0.461 × 1011 Nm−2; C12 = 0.934 × 1011 Nm−2.

If the density of silver is 10.5 ×103 kg m−3, find out the bulk modulus of silver and the velocity of propagation of the longitudinal and transverse elastic waves in the [110] direction.

c) The lattice constant for KI is 7.06 Å and the Young’s modulus in the [100] direction is 3.15 x 1010 Nm−2. Compute the force constant and the frequency at which electromagnetic radiation is strongly reflected by the KI crystal. The atomic weights of K and I are 39 and 127 correspondingly.

d) find out the temperature at which the lattice heat capacity and the electronic heat capacity of Ag are equivalent. The Debye temperature and the Fermi energy for Ag are 216 K and 5.51 eV respectively.

problem 4:

a) What is the temperature at which the probability of the electrons in silver to have energy 1.01 EF is 10%. (EF for silver is 5.51 eV).

b) By tabulating the values of [(P/αa) sin αa + cos αa] for P = 5Π/2 and different values of αa find out the width of the first allowed energy band.

c) The resistivity of Ge at 40°C is 0.2 ohm m. find out its resistivity at 20°C.

d) Find out the wavelength of the photon whose energy is enough to break up the Cooper pairs in mercury, given that the critical temperature of mercury is 4.2 K.

problem 5:

a) Compute the susceptibility for a He atom in its ground (1s) state.

b) Differentiate between a substitutional solid solution and an interstitial solid solution with suitable illustrations.

c) What are modifiers? Describe with exs the changes in the properties of glasses due to some typical modifiers.

d) describe the process of photocopying based on the principle of xerography.

Physics, Academics

  • Category:- Physics
  • Reference No.:- M92528
  • Price:- $70

Priced at Now at $70, Verified Solution

Have any Question? 

Related Questions in Physics

A 2kg book is sitting on a horizontal glass table top a

A 2kg book is sitting on a horizontal glass table top. A woman pushes the book across the table with a horizontal force F. The book's position changes as a function of time given by x(t) = (2.9 m/s^3)t^3-(3.6 m/s^2)t^2. ...

A if x3 y3 - xy2 5 find dydxb using your answer to part a

(a) If x 3 + y 3 - xy 2 = 5, find dy/dx. (b) Using your answer to part (a), make a table of approximate y-values of points on the curve near x = 1, y = 2. Include x = 0.96, 0.98, 1, 1.02, 1.04. (c) Find the y-value for x ...

A kilogram weighs about 22 poundsa write a formula for the

A kilogram weighs about 2.2 pounds. (a) Write a formula for the function, f, which gives an object's mass in kilograms, k, as a function of its weight in pounds, p. (b) Find a formula for the inverse function of f. What ...

A truck travels due east for a distance of 14 km turns

A truck travels due east for a distance of 1.4 km, turns around and goes due west for 6.9 km, and finally turns around again and travels 2.5 km due east. (a) What is the total distance that the truck travels? (b) What ar ...

1 implement the covariant ica algorithm and apply it to toy

1. Implement the covariant ICA algorithm and apply it to toy data. 2. Create algorithms appropriate for the situations: (a) x includes substantial Gaussian noise; (b) more measurements than latent variables (J > I); (c) ...

1 in terms of the wavelength of the sound wave about how

1. In terms of the wavelength of the sound wave, about how far below the open end of the resonance tube is the first resonant position? 2. The speed of sound in air is 345 m/s. A tuning fork vibrates above the open end o ...

Why is it important to study global demographywhat are the

Why is it important to study global demography? What are the forces behind population change? Malthusian Theory: A flawed prediction, or a premonition of times to come? 300 words min. NO PLAGIARISM PLEASE.

A modern-day zeppelin holds 9390m3 of helium compute its

A modern-day zeppelin holds 9,390m3 of helium. Compute its maximum payload at sea level. (Assume the helium and air to be at 0°C and 1 atm.)

Implement gibbs sampling for the inference of a single

Implement Gibbs sampling for the inference of a single one-dimensional Gaussian, which we studied using maximum likelihood in section 22.1. Assign a broad Gaussian prior to µ and a broad gamma prior (24.2) to the precisi ...

1 describe each of the five criteria for identifying a

1.) Describe each of the five criteria for identifying a casual effect and provide an example of each. Which are best demonstrated through experiments? Why? Which do experiments not demonstrate well? How can experimental ...

  • 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

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen