Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

problem 1)a) Compute packing fraction of FCC lattice. State two crystals having FCC crystal structure.

b) Cobalt is usually found with hexagonal crystal structure. Recently it was found that it crystallizes with simple cubic structure now called ε-cobalt having a= 6.097 Å. The density is 8.635 g/cm3. The unit cell contains 20 atoms. Compute the number of atoms in 2nM diameter nanocrystal.

c) What is the significance of surface to volume ratio of nanostructures?

problem 2)a) How do you distinguish a nanoparticle in terms of its physical size in the case of optical properties of semiconductor materials?

b) Derive the expression for exciton Bohr radius. How is it related to Bohr radius.

c) Compute exciton Bohr radius of the following: InAs with me = 0.02 m0 , mh = 0.4 mo and ε = 14.5.

problem 3)a) What are the types of excitons? Derive the expression for the total energy of an exciton in terms of Rydberg’s constant.

b) How do you define the confinement regimes for semiconductor nanoparticle.

problem 4)a) describe possible solutions of Schrodinger’s equation for 1D well of arbitrary form depending on the boundary conditions in terms of energy of the particle and strength of potential well.

b) Define energy density of 1D continuous medium. Show that energy density for travelling plane wave is independent of coordinate and is proportional to ω2

c) Define phase velocity of travelling wave.

problem 5)a) describe Tonomura experiment to prove wave-particle duality of matter.

b) describe the electron motion in a 1D potential well of penetrable walls and having finite potential walls.

c) Consider an electron which is placed into a quantum well of width L = 10-6 barrier height V cm and barrier height Vb = 300 mev. Compute the lowest energy level.

problem 6) describe different parts of STM with a neat diagram. How the STM tips are fabricated. How can it be used to understand LDOS of a given nanostructured material?

b) prepare short notes on:

i) Atom lithography.

ii) Scanning probe nanofabrication.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M96327

Have any Question? 


Related Questions in Electrical & Electronics

The rate of shear work per unit volume is given by the

The rate of shear work per unit volume is given by the product tv. For a parabolic velocity profile in a circular tube (see given Example), determine the distance from the wall at which the shear work is maximum. Example ...

Figure 319 in the text shows that des creates 16 different

Figure 31.9 in the text shows that DES creates 16 different 48-bit keys, one for each round. Why do we need 16 different keys? Why can't we use the same key in each round?

Objectivesthe objectives of this experiment are1 to

OBJECTIVES: The objectives of this experiment are: 1) To investigate the operation of automatic reset circuits. 2) To understand the difference between a positive edge triggered, negative edge triggered, and a level trig ...

Want to explain or write report write some sentence under

Want to explain or write report. Write some sentence under each picture or write for all report .. just explain 1. Using oscilloscope, graph the voltage for node 1 to 21 in the schematic. 2. Explain each graph 3. Explain ...

1 what would be the voltage and current standing wave

1. What would be the voltage and current standing wave patterns for an open-circuited line? 2. Discuss the variation with frequency of the input reactance of a short-circuited line and its application in the determinatio ...

What should be the spacing and the relative phase angle of

What should be the spacing and the relative phase angle of the current densities for an array of two infinite, plane, parallel current sheets of uniform densities, equal in magnitude, to confine their radiation to the re ...

Approximate by a number of terms of your choice through the

Approximate (by a number of terms of your choice) through the three forms of Fourier series expansion the periodic signal that in one period is given by Each time a. Plot the approximate signal in time of four periods. b ...

1 can h323 also be used for video2 given the following

1. Can H.323 also be used for video? 2. Given the following message, find the compressed data using run-length coding. AAACCCCCCBCCCCDDDDDAAAABBB 3. Given the following message, find the compressed data using the second ...

In rsa given p 107 q 113 e 13 and d 3653 encrypt the

In RSA, given p = 107, q = 113, e = 13, and d = 3653, encrypt the message "THIS IS TOUGH" using 00 to 26 (A: 00 and space: 26) as the encoding scheme. Decrypt the ciphertext to find the original message.

Does the velocity distribution in example satisfy

Does the velocity distribution in Example satisfy continuity? Example A rotating shaft, as illustrated in Figure, causes the fluid to move in circular streamlines with a velocity that is inversely proportional to the dis ...

  • 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