Fringe Definition and 72 Threads

Homework Statement Two different single slits are used in an experiment involving one source of monochromatic light. With slit 1 in place, the first dark fringe is observed at an angle of 45 degrees. With slit 2, the first dark fringe is observed at an angle of 55 degrees. a) Which slit is...

Homework Statement In a classroom demonstration, a beam of coherent light of wavelength 550 nm is incident perpendicularly onto a pair of slits. Each slit has a width w of 1.2 x 10^-6 m, and the distance d between the centers of the slits is 1.8x10^-5 m. The class observes light and dark...

Homework Statement fringes are observed when a parrallel beam of light of wavelength 500nm is incident perpendiculary onto a wedge-shaped film with an index of refraction of 1.5. What is the angle of the wedge if the fringe separation is 1/3cm? Homework Equations t(x)=xtan(theta)...

Homework Statement A photomultiplier (PMT) is arranged to detect the photons from a double-slit experiment. It is placed at a point P in the detection plane and makes an angle \theta with the horizontal of one of the slits. Assume that the two slits have different widths and that the widths...

Homework Statement The figure shows a neutron in a one-dimensional box. If the right end of the box is opened, the neutron travels out of the box, impinges on a double slit, and is detected 2.0 m behind the double slit. Repeating the experiment over and over produces the fringe pattern shown...

Homework Statement A 550 lines/mm diffraction grating is illuminated by light of wavelength 550nm. How many bright fringes are seen on a 3.1-m-wide screen located 2.1m behind the grating? Homework Equations \DeltaY = \lambda*L/d where Y is equal to the fringe spacing... lamda is...

1. Show that for t<<R, the radius r of a fringe is related to r= (2TR)^1/2 I'm not sure what the relevant equations are, that would be the problem. A gentle shove in the right direction would be appreciated, I've been looking for exactly how to prove it and I can't. ^_^ Thanks for any help!

Did anyone watch this tv show tonight? It had a scene about an immersion tank that reminded me of the William Hurt movie "Altered States". I will be back after Andrew Zimmern's season premiere with more, but here are a few clips from Altered States...

I received this in an email and thought it a rather powerful, well-delivered speech. So, I thought I'd share :smile: http://www.news.harvard.edu/gazette/2008/06.05/99-rowlingspeech.html

Homework Statement Calculate the fringe width of an interference pattern created by two coherent source, 1mm apart and emitting light of wavelength 600 nm. the pattern is observed on a screen 50cm from the source Homework Equations x = dλ/a The Attempt at a Solution I don't know how to...

I have a problem bothering me for a long time. Here it is: suppose I have an asymmetrical parallel plate capacitor with one electrode much larger than the other. For example, the capacitor could be made by depositing small-area metal electrode on heavily doped wafer with 300 nm thermal oxide. Is...

Hi, I'm trying to measure some low capacitance using parallel plates i built. We're probably looking into the pF, say maybe 20pF (with the pcb board etc). The change in capacitance that i am really interested is very small. For the moment, i have use water as my dielectric. The capacitance...

Question Two glass plates 10.0 cm long are in contact at one end and separated at the other end by a thread 0.0500 mm in diameter. Light containing the two wavelengths 400 nm and 600 nm is incident perpendicularly. At what distance from the contact point is the next dark fringe? Relevant...

Homework Statement I'm unable to understand the production of dark fringe in the central point of contact of lens.The text says "the path difference between the rays reflected at the top & bottom of air gap at the point of contact is zero.Actually the ray reflected from the top of air film...

# A Fresnel biprism arrangement used to study interference in air is immersed completely in a liquid. Will the fringe width increase, decrease or remain unchanged?

I was surfing some old exam questions and I found a nasty one... They asked to prove the existence of fringe effects of the electric field at the edges of a plate capacitor, using Maxwell's laws. In class we always assumed the ideal capacitor without fringe effects so I'm having some kind of...

Hi, Why do fields fringe at the edges of plates i.e the eletric field at the edges of a parallel capacitor arrangement? Is there a way of calculating how far these fields fringe outwards? And finally, what effect they have on the overall capacitance. Answers to ANY part of this post...

I am reading Paul Tipler's Fundamentals of Modern Physics, (Worth Pub., 1973) and would like to understand how ΔN (Eq. 1-5, pg. 6) )is arrived at. Here is the derivation as I understand it up to that point: Michelson devised an experiment to determine the difference in the number of fringes...

Recent double-slit experiments with massive molecules, such as fluoro-fullerene consisting of 108 atoms and atomic mass 1632, http://physicsweb.org/articles/world/18/3/5/1", show that the interference fringe will disappear if the FF molecule emits a thermal photon, or collides with a gas...

He's going someplace and there's no ... :-p There is this ant who has been crawling along the bottom hanging fringe of a lampshade by the computer for some time now, probably an hour, though he does go back onto the lampshade from time to time. Amazingly he can crawl from strand to strand...

What are your favorite beyond strange fringe claims? I just heard a great one! The chupacabra are ETs pets! :smile:

I'm working on a modification of Fizeau's experiment in 1851 about the addition of velocities. I've derived the formula for the fringe shift. But the problem is I actually don't know what it is. I know it's the movement of the interference pattern. But it has no unite, so what is the meaning of...