Register

Homework Help Question and Answers

Submit a new Query

Recent Homework Help Question & Answers


Question 44471

posted 10 months ago

Calculate the Jones vector of the beam exiting the polariser.
What is the ratio of output power to input power in this optical system?

View answer

Question 36477

posted 1 years ago

In a three dimensional semiconductor crystal with a perfect lattice. Assume the distance between atoms is 'b' center meter. The reciprocal lattice is what we call k-space. It's Fourier transform of original lattice. We solve the Schrödinger equation of electron wave in original periodical lattice with one unit cube of side length of b and obtain the electron wave mode. We can represent all solutions in the k-space with each point of the k-value as one solution i.e. one mode. This problem is asking you to derive the mode density in this crystal.
c). How many cells in the spherical shell in total? (5 points) Due to k can only be positive, how many cells in the first quadrant? (5 points) Each k point can correspond to two modes for electron spin up and spin down. So how many modes in the first quadrant in k-space. (5 points)
a). Assume the electrical potential distribution is infinite near the atoms. This results in a periodic solution with periodic unit (T/b, T/b, T/b) in kx, ky and kz directions of k-space. Write done the volume of the unit cell in the k-space. (5 points)
d). if we related the results to the density of modes, we can equal it to p(k)*dk, where the p(k) is the density of the modes. Please find the p(k) based on c) result. (5 points)
e). Based on d) result, please normalized it to unit volume mode density. (5 points)
b). Imagine in k-space, there is a spherical shell, the radius of the inner sphere is k, the thickness of the shell is the differential dk, write down the volume of the spherical shell. (5 points)
f). Based on e), convert unit volume normalized p(k) to p(v) by using p(k)dk=p(v)dv relationship.It's more convenient to use frequency v instead of k in the real practice. (5 points)

View answer

Question 34779

posted 1 years ago

2. Compare your data to your model. To model an inverse square, first calculate the inverse square of the distance data, and then compare itto the illuminate data. (the model with the inverse square is already in the first image)

View answer

Question 34778

posted 1 years ago

1. Examine the graph of illuminance vs. Distance
these questions correspond to an experiment called light brightnessand distance. In this experiment, you will use a light sensor to measurethe illuminance detected by the sensor in lux. You will observe howilluminance varies with distance and compare the results to amathematical model.

View answer

Question 34780

posted 1 years ago

3. How well does the model fit your experimental data? Do your data approximately follow an inverse square function?after the analysis questions above, jump to some conclusions

View answer

Question 35384

posted 1 years ago

5. Show that for a double slit Fraunhofer diffraction pattern, if d = mw, the number of bright fringes within the central diffraction maximum will be equal to 2m.

View answer

Question 35385

posted 1 years ago

A transmission diffraction grating has 300 lines per millimetre and is illuminated from the normal. What is the range of first-order diffraction angles for visible light 380 to 740 nm?

View answer

Question 35383

posted 1 years ago

4. The angular distance between the centre and the first minimum of a single-slit Fraunhofer diffraction pattern is called the half-angular breadth; find an expression for it. Find the value for a slit width of 0.1 mm and a wavelength A = 650 nm. What would be the corresponding distance on a viewing screen 2 m from the slit?

View answer

Question 35380

posted 1 years ago

1. What is the result of the superposition of two monochromatic, counter-propagating electromagnetic waves A cos(kz – wt) and A cos(kz + wt)?

View answer

Question 35381

posted 1 years ago

2. By considering the plot of Fresnel diffraction from an opaque edge, what is the transverse distance from the classic shadow edge to the line of peak irradiance? Estimate the value for A = 650 nm (red) and a distance of z = 1.0 m from the opaque screen.

View answer

Questions not Found

Most popular subject

Thermodynamics

Essay/Summary

Mechanics

Complex Analysis

Engineering Economics

Calculus

Modern Physics

General Chemistry

Strength Of Materials

Fluid Mechanics

x