Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

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

1 how many gy of exposure is needed to give a cancerous

1. How many Gy of exposure is needed to give a cancerous tumor a dose of 40 Sv if it is exposed to α activity? 2. What is the dose in Sv in a cancer treatment that exposes the patient to 200 Gy of γ rays?

An ideal gasnbspis compressednbspisobarically fromnbsp872

An ideal gas is compressed isobarically from 8.72 m 3  to 5.41 m 3  at a pressure of 2.04 x 10 5  Pa due to the addition of 2.35 x 10 5  J of heat. What is the change in the internal energy of the gas? Express your resul ...

Electrons are slowly injected by tunneling into the

Electrons are slowly injected by tunneling Into the SiO 2  from Si in a MOS transistor when a high electric field appears across the oxide. A small but significant fraction, about 10 -4 , of the injected electrons will b ...

What are the 3 sociological perspectives on health and

What are the 3 sociological perspectives on health and illness? Describe what some of the problems in U.S. healthcare are according to our text and the supplemental article.

Investigate how fast sexual and asexual species evolve if

Investigate how fast sexual and asexual species evolve if they have a fitness function with interactions. For example, let the fitness be a sum of exclusive-ors of pairs of bits; compare the evolving fitnesses with those ...

What is the maximum voltage that can be generated by a

What is the maximum voltage that can be generated by a silicon solar cell?

A pomegranate is thrown from ground level straight up into

A pomegranate is thrown from ground level straight up into the air at time t = 0 with velocity 64 feet per second. Its height at time t seconds is f(t) = -16t 2 + 64t. Find the time it hits the ground and the time it rea ...

Derive the ideal soliton distribution at the first

Derive the ideal soliton distribution. At the first iteration (t = 0) let the number of packets of degree d be h 0 (d); show that (for d > 1) the expected number of packets of degree d that have their degree reduced to d ...

A wetted-wall column as illustrated in figure is used as a

A wetted-wall column, as illustrated in Figure, is used as a mass-transfer device for transferring ethyl acetate liquid to an air stream by a mass-transfer limited evaporation process. At the current conditions of operat ...

Sketch the posterior probability ppa saba f 3 what is the

Sketch the posterior probability P(pa | s=aba, F =3). What is the most probable value of pa (i.e., the value that maximizes the posterior probability density)? What is the mean value of pa under this distribution?

  • 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

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

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