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

A line assumed to be infinitely long and of unknown

A line assumed to be infinitely long and of unknown characteristic impedance is connected to a line of characteristic impedance on which standing wave measurements are made. It is found that the standing wave ratio is 3 ...

Consider the problem of identifying the nonlinear

Consider the problem of identifying the nonlinear discrete-time system in (9.9.4) using a raised-cosine RBF network. Let the number of past inputs be m = 1 and the number of past outputs be n = 1. Suppose the range of va ...

Assignment questiondesign automatic fan speed controller

Assignment Question Design automatic fan speed controller based on the temperature variation in room using a microcontroller. Abstract: The electronic Circuit used to control the speed of fan based on temperature variati ...

1 state and briefly discuss the basic definition of the

1. State and briefly discuss the basic definition of the curl of a vector. 2. What is a curl meter? How does it help visualize the behavior of the curl of a vector field? 3. Provide two examples of physical phenomena in ...

For each of the following baseband signals i mt cos 1000t

For each of the following baseband signals (i) m(t) = cos 1000t, (ii) m(t) = 2cos 1000t + cos 2000t, and (iii) m(t) = cos 1000t cos 3000t: a. Sketch the spectrum of m(t). b. Sketch the spectrum of the DSB-SC signal m(t) ...

1 how do you find the work done in moving a test charge by

1. How do you find the work done in moving a test charge by an infinitesimal distance in an electric field? 2. What is the amount of work involved in moving a test charge normal to the electric field? 3. What is the phys ...

1 obtain the equations for a one-dimensional steady viscous

1. Obtain the equations for a one-dimensional steady, viscous, compressible flow in the x direction from the Navier- Stokes equations. (These equations, together with an equation of state and the energy equation, may be ...

In digital communication systems transmission of digital

In digital communication systems, transmission of digital data is encoded using bandlimited pulses in order to utilize the channel bandwidth efficiently. Unfortunately, bandlimited pulses are nontimelimited; they have in ...

A certain communication channel has a bandwidth of 10 khz a

A certain communication channel has a bandwidth of 10 kHz. A pulse of 0.5 ms duration is transmitted over this channel. a. Determine the width (duration) of the received pulse. b. Find the maximum rate at which these pul ...

A force f is applied at the tip of the uniform bar shown in

A force F is applied at the tip of the uniform bar shown in the figure. The displacement of the bar is given as u(X) = λX where λ is the principal stretch. The initial length and the cross-sectional area of the bar are, ...

  • 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