Diffraction Definition and 1000 Threads

Hello, I am wondering how does a reflection diffraction grating work. Most physics text simply ignore this topic or talk in very ambigious terms. I understand that in transmission diffraction grating, you have parallel grooves so that light can pass through and produce an interference pattern...

I know that in a double-slit experiment, the diffraction of the individual slits produces the envelope of the intensity pattern whereas the interference between the waves coming from the slits produces those little wiggles within that envelope. But what exactly is the difference between...

I am looking for a free Electron diffraction simulation software/program (Windows-based software). Please let me know where to download! Thanks! :!)

Please tell me what I need to know and what equations I need to use for these type of problems. Please define the variables in the equations too. Thanks. -Sketch or identify the intensity patteren that results when monochromatic waves pass through a single slit and fall on a distant screen...

There are some objectives that I need to complete by this week. Please help me determine what they are by offering equations/experiments that relate to them. Thanks! Relate the amplitude produce by two or more sources that interfere constructively to the amplitude and intensity produced by a...

Diffraction Question: Calculating m... Homework Statement There are 5620 lines per centimeter in a grating that is used with light whose wavelength is 471 nm. A flat observation screen is located at a distance of 0.750 m from the grating. What is the minimum width that the screen must have so...

Homework Statement A diffraction pattern is produced on a screen 130 cm from a single slit, using monochromatic light of wavelength 460 nm. The distance from the center of the central maximum to the first-order maximum is 2.20 mm. Calculate the slit width. (Hint: Assume that the first-order...

Homework Statement Light that has a wavelength of 668 nm passes through a slit 6.73 x 10^-6 m wide and falls on a screen that is 1.85 m away. What is the distance on the screen from the center of the central bright fringe in the third dark fringe on either side? Homework Equations I will...

A reflection grating is required that can resolve wavelengths as close as 0.02A (angstroms) in second order for the spectral region around 350 nm. The grating is to be installed in an instrument where light from the entrance slit is incident normally on the grating. If the manufacturer provides...

Homework Statement A grating with 3000 lines per cm is used to disperse green light (500nm) and another light of unknown wavelength on a screen 2 m from the grating. The linear separation between the green and unknown light on the screen in the second order is found to be 10 cm. Find the...

In the single slit diffraction the condition for minimum intensity is that Del S= n*lamda n=1,2,3,...natural number the extreme path difference is equal to integral numbers of wavelength ( in the double slit experiment it is the condition for maximum intensity). It is understandable in the...

A single slit has a width of 1.5 x 10^6 m and is used to form a diffraction pattern. Find the angle that locates the second dark fringe when the wavelength of the light is each of the following. (a) 425 nm (b) 650 nm I answered with (a) 16.46 and (b) 25.68 but these answers...

For a wavelength of 420 nm, a diffraction grating produces a bright fringe at an angle of 26°. For an unknown wavelength, the same grating produces a bright fringe at an angle of 56°. In both cases the bright fringes are of the same order m. What is the unknown wavelength? ________________nm...

Homework Statement Late one night on a highway, a car speeds by you and fades into the distance. Under these conditions the pupils of your eyes (average refractive index = 1.36) have diameters of about 7.0 mm. The taillights of this car are separated by a distance of 1.3 m and emit red light...

Homework Statement A ruby laser (\lambda = 694.3nm) is aimed in free space at a target 10,000km away. If the laser beam is initially 14cm in diameter, how large will its diameter be when it hits the target taking account of diffraction at the circular aperture of the laser? Homework...

can anyone explain to me, where does the equation R=\frac{0.61\lambda}{sin\theta} come from when determining the approximate radius of the nucleus by electron scattering?

[SIZE="3"][FONT="Georgia"]Hey, I have to answer the following multiple choice questions ... its relevant to my exam which is day after tomorrow. Can anyone please tell which options should be the answers and why... I don't have any clue about these. So please don't delete this post ... instead...

I'm doing my thesis and i have to teach electron diffraction to high school students. Can you propose to me any route to develop my teaching process, to be understood from high school students?

We look at a lamp at a distance through a slit form the halves of a broken razor blade and a diffraction pattern is observed. My questions are: 1. Is it a Fraunhofer diffraction? Our eyes are close to the slit, but one of the conditions for fraunhofer diffraction to occur is the screen...

I am asked to show that it would be impossible to determine exactly which slit a single photon of light passed through in a double slit diffraction grating without destroying the resulting interference pattern since in order to do so, we would need to know both the momentum and position of the...

Why does wavelength affect diffraction? For example, red light with a longer wavelength can easily bend around objects. I'm assuming that because of the characteristic longer wavelength, it can just easily bend (flex) as opposed to blue light with would have difficulty becuase of shorter...

Homework Statement Monochromatic light falls into slit 3.00*10^-6 wide. The angle between the first dark fringes on either side of the cental maximum is 25 derees. Calculate the λ. w=3.00*10^-6 m ө=25˚ Homework Equations sin(ө) = nλ/w sin(ө) = ((m+0.5)λ)/w Δy=λL/w The Attempt...

Homework Statement Diffraction and interference occur for wave phenomena such as light and water waves as well as sound waves. During a lecture on diffraction, Steve's eyelids droop,meaning that he closes his eyes until he is looking out through his eyelashes. Then, a green light (lambda= 6...

Hey guys, We are going through single-slit diffraction recently in Physics, I understand that using Huygen's Principle, we can treat the slit as a series of segmented wave sources, and they will interfere with each other based on their phase difference because of the path difference they...

Diffraction or Distraction?? A row of seats is parallel to a stage at a distance of 8.1 m from it. At the center and front of the stage is a diffraction horn loudspeaker. This speaker sends out its sound through an opening that is like a small doorway with a width D of 0.072 m. The speaker is...

Hi all, I'm working in an exercise of advanced optics related to diffraction, in Fraunhoffer's aproximation. I need to calculate the FT of a gaussian multiplied by a rectangle function, i.e, FT(exp(-x^2)*rect(x/a)), and I can't obtain a result expressed using analytical common functions. I...

Question 1 — Construct the crystal lattice from the diffraction pattern drawn on page 5 of this exam paper making sure you include the (110) and (220) planes. Explain the procedure used in reconstructing the crystal lattice. What Bravais lattice is represented by the diffraction pattern...

Hello, this is the first time I'm sending a message and i don't know so good the procedure. Please forgive me for my english but I'm from greece, thus i am not experienced in speaking english, but i'll try to be as plain as i can. I'd like to ask something about electromagnetic waves. I'm...

Im trying to get a good physical picture of what is causing the interference pattern in single slit diffraction (Im using a water wave that goes through a slit and then hits a wall I am also ignoring reflections)... Let me know if I am on the right track... I am picturing a wave front...

What is the purpose of the reflecting and limiting sphere in diffraction?

I keep hearing that single-slit diffraction only occurs when the magnitude of the wavelength of the wave is larger than the slit. But according to the diffraction equation asin(theta) = m(lamda), minima can never occur when the wavelength is greater than the slit. I've tried reading my textbook...

I've encountered a standard problem about single slit diffraction, but there's a slight change to the problem and I don't know how it should be dealt with. The question is: A plane wave of 400-nm light is incident on a 25-µm slit in a screen, as shown in the figure below. At what incident...

Hi. I am a bit confused with this question: A plane wave of 400-nm light is incident on a 25-µ(mu) m slit in a screen, as shown in the figure below. At what incident angle will the first null of the diffraction pattern be on a line perpendicular to the screen? (picture is attached). Do I...

I just want to make sure i got these questions answered correctly about multiple slit diffraction gratings: specifically a grating spectroscope. 1. Why is the 2nd order spectrum more "spread out" than the first order spectrum? Is it because one light wave has to travel 2 wavelengths...

Hi - I'm trying a problem on diffraction grating, and I keep on getting stuck. Maybe someone can help me figure out the last step: Three, and only three, bright fringes can be seen on either side of the central maximum when a grating is illuminated with light ( wavelegnth = 490 nm). What is...

I know I'm just a newbie, but i need your help guyz :blushing: This is a matter of life and death Thanks! --> In conventional television, signals are broadcast from towers to home receivers. Even when a receiver is not in direct view of a tower because of a hill or building, it can...

I've been working on my Physics work when I scanned across a section and noticed something that bothered me. The equation: d sin (thetha) = m (wavelength). d is the separation and m is an interger. However, it said to find the bright fringes of a double slit (Young's Double Slit...

Thank you for your insights on this. Suppose our kitchen table has a double glass top. Here and there it produces Newton's rings type interference patterns. I understand that by reverse transforming an interference pattern you can recover an image. If I were to somehow do this...

I'm pretty sure the equation for finding the minima in a diffraction pattern is: \sin\theta_m = m\frac{\lambda}{a} Where m is an integer which is 1 for the first minima, 2 for second, etc, lambda is the wavelength of the wave and l is the width of the opening. And I'm pretty sure the...

Waves bend when they pass throungh a narrow gap.It is the definition of diffraction. what is the reason that when the water waves pass through a narrow gap in ripple tank the wavefronts become circular? what is the reason that when the water waves pass through a wide slit in ripple tank the...

Ok, I read that diffraction only occurs when wavelength is larger than than the obstacle/opening. But then I find an equation looking like: sin(theta) = wavelength/width opening For determining the diffraction. Now if the wavelength has to be larger than w for diffraction to occur, why is...

What is the standard Diameter for the wire. This one is from my lab of diffraction of a light from a single slit and on a wire. Thanks in advance for your help.

Imagine you are trying to measure the width of a single strand of spider web. You have fastened the web to the slide, only rather than mounting the strand vertically as you did with the hair, you have mounted it horizontally. You illuminate the strand with a 650nm laser and project the resulting...

I have the follwoing question for prep for a lab, i have tried to work out the answer but i am struck with trying to work out the intensity at a certain point, in this case 4.1mm from the central maximum. I have tried using trig to calculate the angle to the point using trig then using...

Hi, please can someone explain me the following questions about interference: Radio waves are readingly difracted around buildings whereas light waves are negligibly diffracted around building. this is becauseraio waves : 1- are polarized 2-have much longer wavelength (WL) than ligth waves*...

Good day, I happened across an interesting interactive JAVA applet demonstrating the diffraction of light through a slit. (http://micro.magnet.fsu.edu/primer/java/diffraction/basicdiffraction/index.html" ) Associated with it was the equation, sin θ = λ/d where d is the width of the...

Hello, I was wondering if diffraction could be observed even in humans, but I can't prove it. Which is the De Broglie wavelength of a human? Is it possible to observe diffraction when a human passes through a door?:rolleyes:

An electron is diffracted like a wave when it passes through a double slit, which is narrower than the de Broglie wave length of electron. However, doesn't electron interacts with its surrounding ? (air molecules, screen, etc.) And since interaction equals to observation, isn't the electron...

hi, i'm having trouble with a problem regarding X-ray crystallography. the question is as follows: ---------------------------------------------------------------------- In general, crystals can have various symmetry elements: rotation, translation, reflection, etc. however, you never...

In order for diffraction to occur, the slit width must be on the order of the wavelength, correct? I'm puzzled because if the wave is measured along the x-axis while the slit is along the y-axis, I don't see the connection. Is this best described as a quantum mechanical effect? By passing...