Diffraction Definition and 1000 Threads

Green and orange light pass through a diffraction grating that contains 6000 lines/cm. Compare the appearance of the fringe at m = 0 with all the others. So far I've only dealt with light with one wavelength, so I just want to make sure I have the right thought process here for two...

Spontaneous collapse theories like GRW postulate that elementary particles have a 10 to the -16 probability per second for spontaneously collapsing in the position basis, where the collapse function involves multiplication by a Gaussian. Entanglement then guarantees that macroscopic objects are...

Homework Statement A broad beam of light, of wavelength 683nm is sent directly down through the top plate of a pair of glass plates. The plates are 120mm long, touch at the left end and are separated by a wire of a diameter .048mm at the right end. Air between the plates act as a thin film...

What would happen to the XRD pattern if instead of having spherical atoms, we had triangular atoms? I found the optical diffraction pattern for a triangular aperture, but I'm not sure if optical diffraction patterns would be the same as XRD patterns.

Homework Statement Consider an array of parallel wires with uniform spacing of 1.40 cm between centers. In air at 20.0°C, ultrasound with a frequency of 35.6 kHz from a distant source is incident perpendicular to the array. (Take the speed of sound to be 343 m/s.) (a) Find the number of...

Consider a Newtonian reflector telescope: As you can see in the image, the little secondary mirror inside the main tube is supported by an X structure called 'spider'. The four "legs" of the spider, called 'vanes' by astronomers, are actually thin stripes of high-tensile material, usually...

Hi, I'm considering the case of diffraction by an object, with dimensions far smaller than the wavelenght of the light source. If I consider for example an sphere with radius 1nm, or a cube with edge length a≈2nm , and the usual λ≈500nm, how will the finite shape of the obstacle be of...

I couldn't find this else where so i figured id ask it here. What is the relationship/difference between the two? To me diffraction just seems like a generalized and/or classical way to describe Heisenbergs Uncertainty principle. So question: Are the two phenomena the same thing?

Hi Everbody, I am having a bit of trouble with an AS Physics question regarding diffraction gratings. I have managed to solve the problem that I have been facing, although I am not completely sure that I got to it through the correct means, and also why the answer is such. Homework...

Homework Statement Which electromagnetic wave would cause the most significant diffraction effect for grating diffraction? a. infra red (10-5 m) b. micro wave (10-2 m) c. ultraviolet (10-8m) d. X-ray (10-10m) Homework Equations The Attempt at a Solution I know the most...

Homework Statement At a temperature of 18°C a beam of diffracted monochromatic x-rays is observed at an angle of 150.8° to the incident beam after being diffracted by a crystal with cubic structure. At a temperature of 318°C the corresponding beam makes an angle of 141.6° with the incident...

Homework Statement Light of wavelength 680nm falls onto a single slit. The diffraction pattern is observed on a screen 50cm away. If the distance between the first and the third minima is 3mm, calculate the slit width? Homework Equations sin thetha = m*lambda/a y = m*lambda*R/a...

The question is rather simple... Why is the central fringe brighter in diffraction?

An incandescent lightbulb produces incoherent light. But on Wikipedia, for instance, there is a picture of it producing a rainbow diffraction pattern on the diffraction grating page. But since the bulb is putting out incoherent light, it should be intensities rather than fields that add...

In this experiment, the graphite is a polycrystalline structure. That's is why we observe two intense rings. What will happen if it was a monocrystal? And why? Thank you.

Hi, I was wondering what the diffraction pattern would be like if the suns light is diffracted through a pin hole or double slit diffraction grating compared to that of a laser beam? thanks.

Homework Statement I'm having difficulty understanding why this equation makes sense for the following m values. Homework Equations The following is stated in my textbook. For dark fringes, sinθ = (mλ)/a where λ is the wavelength of light in nanometers and a is the width of the single...

Hello, I'm having some trouble understanding the concept of two function convolution in Fraunhofer diffraction. Let's say I have an aperture function in the shape of some cosine function (which is always above zero), and I want to calculate the transmission function if I only illuminate 3...

Homework Statement A grating places a spectral line of wavelength 681 nm at 12 degrees in first order. At what angle is a line of wavelength 439 nm observed in second order? Homework Equations I believe dsinθ= mλ The Attempt at a Solution This is where I get lost, I can solve...

Homework Statement Suppose a water wave is moving from left to right in a water tank. The water tank is divided to two region (left and right) by an one-slit plastic plate. Which of the following(s) adjustment can increase the degree of diffraction of the wave ? (1) Make the water of the...

Size of the "Diffraction grating"? Is the size of the "Diffraction grating" related to the sharpness/brightness of the lines of spectrum which are produced by it? Thanks.

Hello, Is there an established relationship between the diffraction intensity that a sample produces with its band structure? Thanks

Hi, I'm currently taking a Wave and modern physics class and we recently finished two chapt: interference and diffraction. I'm having a hard time grasping the difference. I understand that diffraction is the expansion of light when it goes through a small opening ( it "flares" out...

Homework Statement Homework Equations The Attempt at a Solution Part(a) Diffraction is the bending of light about an aperture. To be able to resolve two distinct images, the minimum angle must satisfy the rayleigh criterion. Any angle smaller will hence affect the quality of...

Homework Statement A lens is designed to work in the visible, near-infrared, and near-ultraviolet. The best resolution of this lens from a diffraction standpoint is Options: a.) the same for all wavelengths. b.) in the near-ultraviolet. c.) indeterminate. d.) in the near-infrared. e.)...

Homework Statement 4. Light from a mercury discharge lamp contains 2 yellow lines at 577 nm and 579 nm. Find the angle of diffraction for the 577 nm line in second order when passed through a grating having 2400 lines at 80 lines per mm. What is the expected dispersion in second order in the...

Homework Statement a narrow beam of laser light (i.e coherent monochromatic light) wavelength 630nm is incident on a grating having 300 lines per mm. a piece of paper is curved 180 degrees beyond the grating. calculate how many spots of red light should be seenHomework Equations...

Homework Statement White light is incident normally on a diffraction grating with slit separation d of 2.00x10^-6m. a)Calculate the angle between the red and violet ends of the first-order spectrum. The visible spectrum has wavelength between 400nm and 700nm. b)Explain why the second and the...

If the width of the single slit is much smaller than the wavelength of a monochromatic light, until there is only one point on the wavefront can pass through it? Thank you

Hi all, So, I'm trying to "hit" the diffraction limit (i.e. view Rayleigh criterion, or Abbe or Sparrow criterion) with my light microscope . Bought the scope off amazon..it's a typical AmScope that has 2000x magnification limit... But the trouble is I can't find a good sample of two spots...

(My (old) background is math & computer science. I've long loved (mostly) precious opals - for their esthetics, lapidary potential, synthesis (which I've done), and how the play-of-color ("PoC") is produced.) I recently did another couple of passes on the latter in the process of trying to...

hi.. I have been struggling, since a long time, to understand how is the diffraction pattern obtained by a slit of width of the order of the wavelength of light used is obtained, but found no answers! As per the idea of wave theory (and Fermat's principle) it is the wave nature (specifically...

Hi all, If we have any setup that causes diffraction with light, such as a single slit, and count the number of photons detected at a certain point behind this slit, is it true that we can determine this count as follows: 1. Consider each point in the slits a new wave source, and calculate...

Hi, What is the difference in the setups of the Young's double slit experiment and the two slits diffraction? I found textbooks discuss each differently, yet I found no difference in the setup. Thanks to any help.

Homework Statement For the diffraction grating that used to detect the wavelength of a wave, we use d sinθ= nλ. When we find r1-r2 to get nλ. 1) What is the assumption we should make? 2)Then why r1-r2 will get λ?Homework Equations d sinθ= nλ...

I'm not sure if I've understood my textbook correctly. Can you tell me if my current understanding is correct: - in a single slit diffraction there's a wide central fringe which is twice as wide as all the other outer fringes - if we had a double slit diffraction instead of a single slit...

Hi, I would like to understand how diffraction works in layman's terms. Why does a wave entering a corner or a slit (in the case of light) bend? I found an answer here, but it doesn't make a lick of sense. http://wiki.answers.com/Q/How_does_diffraction_work What is a probability...

Homework Statement The individual threads in a cloth are very close together. Design an experiment to investigate how the rate at which water passes through the material depends on the separation of the individual threads in the material. Available equipment...

Consider the following video... http://www.youtube.com/watch?feature=player_embedded&v=0FGo8mi-5w4 Am I really seeing a demonstration of the HUP or am I just seeing diffraction? In this instance, is it just different models with different terminology describing the same thing? If so, what...

Homework Statement Buckyballs are soccerball-shaped molecules consisting of 60 carbon atoms (Mass of C60 = 1.2024×10-24 kg) with an approximate diameter of 1 nm. A beam of buckyballs with each molecule carrying a kinetic energy of 0.60 eV is normally incident on a grating with a slit with of...

I was wondering if anyone would have a link to, or have, a diagram showing light wave diffraction at an obstacle? That is, when it collides with an obstacle, then diffracts around the corners. It's easy to find diagrams for slot experiments, but am having problems finding a good diagram...

Homework Statement "A beam of neutrons that emerges from a nuclear reactor contains neutrons with a variety of energies. To obtain neutrons with an energy of 0.050 eV, the beam is passed through a crystal whose atomic planes are 0.20 nm apart. At what angles relative to the original beam will...

Homework Statement "A beam of neutrons that emerges from a nuclear reactor contains neutrons with a variety of energies. To obtain neutrons with an energy of 0.050 eV, the beam is passed through a crystal whose atomic planes are 0.20 nm apart. At what angles relative to the original beam will...

Homework Statement Homework Equations λ=xd/nl The Attempt at a Solution Im having some difficulty with the variables, is d= lines/m? and n= 27? from the 50 mark to the yellow mark. then x would be 27*(4.35*10^-6) and l would be 100cm=1m ?

Calculate the diffraction limit of the human eye, assuming a wide-open pupil so that your eye acts like a lens with diameter 0.8 centimeter, for visible light of 500-nanometer wavelength. Is there a formula for this? There are two other parts to this question, but if I get this the others...

Homework Statement Sound exits a diffraction horn loudspeaker through a rectangular opening like a small doorway. Such a loudspeaker is mounted outside on a pole. In winter, when the temperature is 273 K, the diffraction angle θ has a value of 11°. What is the diffraction angle for the same...

hi All, I recently got interested in a general solution to diffraction from an object at verious distance and wavelengths. I came across the Fresnel Kirchoff formula (attached formula from Schnars, digital holography). My problem is I cannot seem to replicate a diffraction that makes...

PIC (A) http://imageshack.us/a/img37/941/img20130104192537.th.jpg PIC (B) http://imageshack.us/a/img23/5496/img20130104192554.th.jpg I hope you can ans it in a simple way as I am just a secondary 6 student :) thx! For pic a, 1. I dun understand why interference occurs when there is 1 slit...

I'm confused about the single slit diffraction pattern. Why are light and dark patterns? Where is the constructive and destructive interference occurring if there is just one wave?

I have a question regarding X-ray diffraction and energy conservation. If one considers elastic scattering from a rod-like structure, the observed diffraction pattern will change as the sample is illuminated from different directions. For some directions the pattern will be point-like, and...