Diffraction Definition and 1000 Threads

Hi guys, I currently have a few doubts with diffraction grating (mostly theoretical-wise), so minimal calculations are involved. I basically did an experiment on diffraction grating, involving looking through a diffraction grating and observing the spectra, aiming a laser beam at the grating...

I'm a novice at this quantum business and was just trying to understand the single slit diffraction experiment and when an electron's position is getting measured in particular. Given my understanding it looks like the electron's position gets measured twice. Once when it is just about to...

Is it possible to perform x-ray diffraction for 2-D crystal like Graphene? If poossible how does the bragg interference criteria look like here?

Homework Statement How do I figure out the intensity of diffraction spots after doing Bragg diffraction on a particular 2D lattice? Homework Equations The Attempt at a Solution I'll guess I make 1 spot in the diffraction pattern the strongest, and the diffraction spots around it...

I have a question regarding light bundles and the diffraction of waves. I've been trying to wrap my head around the processes that govern how diffraction works and it all seems to make sense to me regarding water waves and sound. If I just apply Huygens' principle that every point in a wave is...

I know the concept of diffraction of light, but not yet understood why light should bend passing the edges of objects ! I mean what makes it bend?

What happens to the distance between fringes as the width of the single slit become larger? Does the distance between fringes increases? What happens to the centre bright fringe? Does it become larger with an increasing single slit width? My hunch is: Increasing the width increases the size of...

Wikipedia: Does the wave theory itself (the mathematical formulation) imply that diffraction is more efficient at longer wavelengths? I just want the logical connection of why (for example) radio waves diffract and bend around objects better than visible light. :confused: Thank you.

Homework Statement Monochromatic light with wavelength 580nm passes through a single slit 2.60um wide and 2.10m from a screen. Find the distance between the first- and second-order dark fringes on the screen. Homework Equations y=(n*lamda*L)/d The Attempt at a Solution...

This is an intro lab-based question. Homework Statement I took a 650 nm red laser and shined it through a diffraction grating that claimed it had 13500 lines/inch, which comes to 5315 lines/cm in civilized people units. The grating was placed 30 cm away from a piece of paper on the wall...

Homework Statement Monochromatic light with wavelength 580nm passes through a single slit 2.20um wide and 1.80m from a screen. Find the distance between the first- and second-order dark fringes on the screen. Homework Equations The Attempt at a Solution y=n\lambdaL/2d...

Hey guys this is the problem i need to solve: Light consisting of two wavelengths which differ by 160 nm passes through a diffraction grating with 2.50 x 105 lines per metre. In the diffracted light, the third order of one wavelength coincides with the fourth of the other. What are the two...

Why the term "diffraction" in XRD When there is selective reflection of x-rays from crystals, why the phenomena is called "diffraction"? As we know that diffraction is associated with the bending of waves at the corners of any obstacle, here there does not seem to be any bending around the...

A grating having 600 lines per mm is illuminated with sodium light of mean wavelength 589.3 nm. Determine the maximum order of diffraction that can be observed. By differentiating the expression: d sin θ = m λ, calculate the angular separation in arc minutes in second order for the two...

How could you describe qualitatively how diffraction of a wave through a aperture in terms of the uncertainty principle? Cat

I find problems on Bragg diffraction frustrating. I can't tell how the angles are defined, nor the "planes" in the crystal--they look arbitrary. Why can't I just draw a slash through the crystal at any angle I want and get diffraction off the angles I hit with the slash? Is it just that the...

This is not really a homework question but a more general plea for an explenation from someone! :) In x-ray diffraction, you get a graph with different peaks that are particular to the composition of your sample. But, why are some peaks are of higher intesities then others? What is it about...

Why do waves spread out after emerging from a narrow (\leq\lambda) opening? Also, why do waves change direction at boundaries between regions where the wave speed differs? I have tried to find answers to these questions by searching on the Net, but with no luck.:-(

Quick question (hopefully) Diffraction is often classically described as light bending around corners, Huygen’s Principle treats each point of an advancing wavefront as a new source. My grad physics professor has mummbled one time that diffraction occurs due to the interaction of light...

1. Light of wavelength 632.8nm is normally incident upon a grating of 5000 lines/cm. How many different diffraction orders can be seen in transmission? 2. m(lambda)=d(sintheta) 3. According to my text, d=1/5000lines/cm = 2x10^-6m and sintheta= lambda/d = 632.8x10^-9/ 2x10^6 =...

Circular Diffraction Patterns HELP! Homework Statement Homework Equations theata_1=1.22(lambda)(L)/D L distance from screen, D diameter of slit w=2.44(lambda)(L)/D The Attempt at a Solution so this is what i did not sure where i went wrong maybe at rounding off...

Homework Statement First I have one general question about single-slit diffraction patterns. I've never fully understood this phenomenon. In my book it is stated that there will be minima when the waves from the top and the bottom of the slit differ exactly a whole wavelength, because one...

Hi guys, My research project involves a paraboloidal telescope with a primary diameter of 25 meters, and a focal length of 10 meters. My goal is to come up with the mathematics and numerics to determine the surface profile error of the primary mirror. We will take a point source of 2mm...

Actually, I'm studying for my entrance exams to college. I think the professor made a mistake. So , the question says : A diffraction pattern of a light beam from a narrow slit and from a thread are : a)Completely identical b)Totally different c)Identical except for the center. He...

Homework Statement Monochromatic light of wavelength 441 nm falls on a narrow slit. on a screen 2.16m away, the distance between the second minimum and the central maximum is 1.62 cm. a) calculate the angle of diffraction thetta of the second minimum. b) find the width of the slit? Rensick...

If you think of a sphereical symmetric diffraction ring, the intensity is constant for each sphereical section (intensity doesn't vary for theta or phi), but it varies kind of like a sine wave in the r dimension from zero to zero with a maximum in the middle of the ring. So that if you think...

So when they make a hologram they use a laser and it gets shot out and goes through a beam splitter and the one beam bounces off a mirror and then the object they want to make the hologram of , and the other beam bounces off a mirror and when the two beams meet they interfere and then hit the...

Do 3d glasses use diffraction to work , because the ones i read about did not say anything about diffraction , but i shed a laser through my 3d glasses and it diffracted it perfectly on the wall , it had a center bright spot and then equally spaced dots from the center out .

It seems like an interaction constrains the wave and creates a diffraction pattern that spreads through space and the rings of the diffraction pattern can likewise be constrained and create their own diffraction patterns.

Homework Statement I'm really struggling with this one. "A diffraction grating with 600 lines/mm is illuminated with light of wavelength 500 nm. A very wide viewing screen is 2.0 m behind the grating." a) What is the distance between the two m=1 fringes? b) How many bright fringes can...

I am interested to know why in any description of electron diffraction apparatus they seem to suggest that the electrons need accelerating up to 5kV (or at least several kV) to show the electron diffraction rings, this seems to give a de Broglie wavelength of around 1.2 x 10^-11m whereas the...

Reading the derivation for the single slit diffraction minima formula from this site, I'm not convinced about its argument. http://www.math.ubc.ca/~cass/courses/m309-03a/m309-projects/krzak/index.html" What I'm having trouble understanding is the explanation of the formula for minima when m>1...

Homework Statement In lab, I obtained a single slit diffraction pattern and recorded an image of it. The slit width is known to be 0.000134 m. We are supposed to compare our experimentally-obtained diffraction pattern to the result of taking a Discrete Fourier Transform of the aperture in...

Homework Statement A grating having 1000 lines per mm is illuminated with sodium light of mean wavelength 589.3 nm. Determine the maximum order of diffraction that can be observed. Homework Equations dsin(\theta)=m\lambda d=slit spacing The Attempt at a Solution The order of diffraction...

Homework Statement Show that the maximum intensity for a diffraction grating of N slits at the first principal maximum is N^2 times bigger than for a single slit. Homework Equations I=I(0)[sin^2(NB)/sin^2(B)] where B is (\pidsin\phi)/\lambda The Attempt at a Solution I feel i...

I read an introductory text about diffraction of X-rays in crystals and I am not sure why the wavelength in the crystal is assumed to be identical to the wavelength outside the crystal. I think that the speed of electromagnetic waves can depend on the type of matter, so wavelenghts can be...

Is the formula for single slit diffraction Dsin\theta = m\lambda identical to the double slit diffraction besides m being minima rather than maxima? More specifically will m + 1/2 tell me the angles between maxima?

If i shot a red laser through the top slit and microwave laser through the bottom slit what would we expect to see in the diffraction pattern would we see a double slit pattern or a single slit pattern , how would the microwaves interfere with the red photons , Or if this is too...

i think its to do with huygens sources?

Hello, I'm pondering on why bending occurs most when the width of the aperture is close to the wavelength of the propagating wave. According to Huygen's principle, should'nt there be point sources around the edges of an aperture regardless of the width and thus the bending propagate to...

Homework Statement A diffraction grating has slit width 0.83 micrometres. When light of 430 nanometres is used, diffracted beams are observed at 14 degrees 55 minutes and at 50 degrees 40 minutes to the zero order. The first beam is assumed to be the first order and the other one can be...

Homework Statement Light with two wavelengths (510.0 nm and 525.6 nm) is spread by a diffraction grating. On a screen 4 meters behind the grating we observe that the diffrence between the two second order maximum is 1 cm. What is the grating constant (d) ?Homework Equations I think i only need...

Homework Statement You have been asked to measure the width of a slit in a piece of paper. You mount the paper 80.0 centimeters from a screen and illuminate it from behind with laser light of wavelength 633 nanometers (in air). You mark two of the intensity minima as shown in the figure, and...

For this question I am considering a slit diffraction experiment set up as follows: {Monochromatic source} ------> {Single slit} ------> {Diffraction grating with N slits} ------> {Screen with small movable detector} The monochromatic light source emits photons one at a time. The principal...

Hi everyone. I need help comprehending single slit diffraction. I am using the textbook: College Physics by Serway / Vuille 8th Edition. This is what it says: "To analyze the diffraction pattern, it's convenient to divide the slit into halves, as in Figure 24.17 (picture below). All the waves...

Homework Statement Waves with small wavelengths diffract less than those with longer wavelengths. Use this information to suggest why ultrasound is much better than ordinary waves for finding the depth of the sea [3 marks] Homework Equations NONEThe Attempt at a Solution Ultrasound has a...

Homework Statement Light from a laboratory sodium lamp has two strong yellow components at 589.5923 nm and 588.9953 nm. How far apart in the first-order spectrum will these two lines be on a screen 1.00 m from a grating having 10,000 lines per centimeter? Homework Equations Grating...

Homework Statement What is the maximum slit width so that no visible light exhibits a diffraction minimum?(Visible light has wavelengths from 400 nm to 750 nm.) Homework Equations D*sin(theta)=m*lambda ; where D = slit width,theta in degrees, m =1,2,3,..., and lambda is wavelength...

Homework Statement The diffraction pattern shown in the figure is produced by passing He-Ne laser light (λ = 632.8 nm) through a single slit and viewing the pattern on a screen 1.58 m behind the slit. What is the slit width? Homework Equations a = {(wavelength)D}/(distance of...

What effect does the distance between the two slits have on the intensity of the maxima?