Interference Definition and 999 Threads

Homework Statement We have a thin film of glass which has thickness t=\lambda and n=1.5 and light (\lambda) passing through it with an angle \theta_0. We have to find the minimum angle that allows us to see both constructive and destructive interference. Homework Equations Max...

Homework Statement I've been reading a book about waves. I skipped the test earlier this year because I had not done any problems and thought it would be a waste of time to try. But now I kind of have to do it, I've re-read the book but it's much to understand and remember. Especially the...

Look at the picture below, I have to prove that the optical path length difference is \Delta=n(BC+CD)-BE=2nd\cos(r) [PLAIN]http://img200.imageshack.us/img200/2271/schermata082455775alle1.th.png The problem is just how to get 2nd\cos(r) I actually don't have any idea :\ I have...

Hello, I am trying to understand thin film (in air) interference but I have a problem: I know we have destructive interference when \delta=(2m+1)\pi. Now i can try to calculate the thickness of the film to get it, so since \delta =\frac{4nt\pi}{\lambda} - \pi where t is the thickness...

Two radio antennas A and B radiate in phase. Antenna B is a distance of 130 m to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of 50.0 m to the right of antenna B. The frequency, and hence the wavelength, of the emitted...

Right so I've been stuck with this for a while now and I'm sure it's just something simple that I've missed. Right so the question says there are a pair of closely spaced slits (0.300mm apart). By changing the spacing the bright fringe moves from position m=2 to m=3. The wavelength remains...

For example, when two light waves completely cancel each other out, there is the black on an interference pattern, indicating absence of light. What happens to the photons? It seems they cease to exist. Also, How does this relate (or not) to the "Conservation of Energy" law? Any...

Homework Statement A college student is at a concert and really wants to hear the music, so she sits between two in-phase loudspeakers, which point toward each other and are 53.2 m apart. The speakers emit sound at a frequency of 459 Hz. At the midpoint between the speakers, there will be...

I have only an completed one course on quantum mechanics so please excuse me if this seems rudimentary. In my course we only dealt with electrons and their interference with one another. Is it possible for an electron and a proton to interfere with one another? Or more generally, can...

Homework Statement At a young's experiment arrangement, there is a 500nm light beam, a distance of 1m from the slits to the screen and a 0.25mm between the two slits In what way the interference pattern will change if an adhesive tape is being taped to one of the slits with a 1mm thickness and...

Can someone explain what the difference is between the expectation value of an observable in a pure vs a mixed state. The equations are identical. For example with spin up and down |A|^2<S_u|O|S_u> + |B|^2<S_d|O|S_d>

In the paper (AIP Conf. Proc. 810 (2006), 360): Mardari outlines three predictions of quantum self-interference, all of which empirical evidence is presented that appear to refute all three. The implications of the paper is interesting but of these I am particularly interested in the...

"consider the same interference experiment,the interference pattern produced is used to illuminate the next source in series,which then produces a new interference pattern,this gets cascaded say 10 times and the final interference pattern is obtained on the wall. now ,the observer, observing...

Homework Statement A beam of electrons is accelerated from rest and then passes through a pair of identical thin slits that are 2 nm apart. You observe the first double-slit interference dark fringes occurring at ±20◦ from the original direction of the beam when viewed on a distant screen. (A)...

Hi, I was wondering if two waves, whom both have the same frequency and wave, could be combined together in a constructive interference way, even if they did not have the same amplitude?

Homework Statement In a large water tank experiment, water waves are generated with straight, parallel wave fronts, 3.0m apart. The wave fronts pass through two openings 5.0m apart in a long board. The end of the tank is 3.0m beyond the board. Where should you stand, relative to the...

in DCQE you can get which way and still get interference? for example when the s-photon strikes the detector ...let's assume setup is such that which-way is known now we send the idler via erasure (after registration of s) and later when we sub-sample via co-incidence counting we get...

Hi, I'm concerned about one question about light interference. It's said that light energy is redistributed during interference. That creates pattern. One slit or double slit interference create maximums and minimums on the screen where the interference takes place. Now imagine a...

If we look at http://en.wikipedia.org/wiki/Mach%E2%80%93Zehnder_interferometer" I think it's fair to say that any interpretation of QM says that there are appear no photons (in idealized case) at detector 2 as there are no detections. Basically that means that photon interference takes place at...

According to EM theory,in the absence of any interaction with matter, destructive interference in one location will always be balanced by constructive interference in another location keeping the law of conservation which means that there is no local conservation law for energy flux regarding...

Is the mechanism behind the single particle interference between photon, electron and buckyball different? Reason for interference Photon - interference caused by maxwell electromagnetic waves? Electron - interference caused by Schroedinger probability waves? Buckyball - interference...

Let's say we send two photons at same time through double slit: Would interference pattern form if: 1. Both the photons are of different polarization? (i.e. one left polarized and the other right) 2. Both the photons are of same polarization?

Can anyone tell me the difference between interference in double slit's and single slit diffraction?

I got an SMS educating people how to find out the presence of a hidden cam in a trial room of a textile showroom or bathroom. It goes like this :- "If you can't make a call in the room,the there is a hidden cam. This is due to the interference of the fibre optic with the signal transfer."...

Idea for a microphone. Hi People! I've had an idea for a monochrome light microphone, which I have rendered as a drawing, attached. The detector consists of a monochrome source (l.e.d.), a reflective membrane (gold leaf) some distance from the source, a static reflective...

In regards to the double-slit experiment, where two waves cancel each other out (causing destructive interference), does that cancel out the particle too? I would assume all particles would form the light areas of the interference pattern. Just don't understand how the light/dark bands are...

I am trying to calculate how wide of a screen you would need in order to observe an interference pattern produced by Young's original real-life double slit experiment. He cut a single narrow slit (width ds) in a window shade, admitting a narrow sliver of sunlight into a dark room. He inserted...

The books say that interference happens basically between the light waves from the two mirrors. But it seems to me that the path difference between the pairs remains constant for all the waves (as long as both the mirrors are perpendicular to each other). So why do circular rings form? How does...

Homework Statement [PLAIN]http://img135.imageshack.us/img135/6027/physicsch3569.png Homework Equations 2L = (m + 0.5) (λ/n) for m = 0, 1, 2, ... (maxima - bright film in air) 2L = m(λ/n) for m = 0, 1, 2, ... (minima - dark film in air) The Attempt at a Solution Bright 2L = (10...

i have a class test tomorrow and I've been studying but i can't find this one equation in the textbook and was looking for some help. I am asked to 'determine the distance between a diffraction grating and a screen by using the interference pattern equation.' this is a practical exam and count...

Homework Statement You are standing 2.5m directly in front of one of two loudspeakers. they are 3m apart and both are playing a 686hz tone in phase. As you begin to walk directly away from the speaker, at what distances from the speaker do you hear a minimum sound intensity? Assume speed of...

I wanted to make tiny movements of the Earth visible by reflecting laser light off liquid gallium metal. It did produce nice reflections on my wall, showing dramatic wobbles of very tiny movements of the liquid gallium. It did however produce light interference patterns which I cannot explain...

Homework Statement I have another Wave Interference problem that I am having trouble with. http://img199.imageshack.us/img199/6104/questionsv.png Homework Equations [PLAIN]http://img151.imageshack.us/img151/3535/hintg.jpg The Attempt at a Solution f = 90.0 MHz λ =...

Homework Statement A piece of paper of thickness 15 * 10^-6 m is used to create an air wedge between 2 glass slides that are 7.25 cm long. If the wavelength of the light being used is 595 nm, how many interference fringes are counted across the entire pattern? Homework Equations delta...

I have no idea where to start with these questions. I am pretty sure I have to use these equations 1. theta = tan^-1(x/D) 2. wsintheta = nlambda 3. dsintheta = nlambda Which order m of in the two-slit interference pattern will give the least uncertainty in the slit spacing, d? a) m = 1 b)...

Lets say I have a double slit interference experiment set up. Now if I cover one slit what CHANGES would be observed ? I know I would see fewer bright fringes and that the intensity of the bright fringes would fall. Is there anything else ?In a different scenario I have a diffraction grating...

Two loudspeakers are separated by 0.50 m on one wall of a room measuring 3.5 m by 7.0 m at a temperature of 22°C. Both speakers generate a constant amplitude sound of frequency 690 Hz, in phase with each other, radiating equally in all directions. What is the shortest distance x along the...

Homework Statement [PLAIN]http://img18.imageshack.us/img18/6175/questionn.gif Homework Equations The Attempt at a Solution At M the waves are in phase and at P the waves have exactly (pi) phase difference. M and P are 2.00 m apart. So it would mean that the largest possible...

Homework Statement Two slits are illuminated with 483 nm light. If the slits are separated by 0.84 mm and each have a width of 0.07 mm, about how many bright interference fringes will be seen in the region of the central diffraction maximum? Homework Equations 2nd = (m + 1/2)\lambda...

If we use a white light in Young's Double slit Experiment, instead of monochromatic light,What will happen?What could be observed on the screen? http://C:\Documents and Settings\Aditya\My Documents\My Pictures/untitled

Homework Statement Roger in ship offshore listening to baseball game on his radio. He notices there is destructive interference when seaplanes from nearby Coast Guard station fly directly overhead at elevations of 777 m, 970 m, and 1163 m. The broadcast station is 98 km away. Assume there is...

Homework Statement Light of wavelength 460 nm falls on two slits spaced .3 mm apart. What is the required distance from the slits to a screen if the spacing between the first and second dark fringes is to be 4mm? Homework Equations Ydark= ((\lambdaL)/d)(m+1/2) Using ydark= .004 m d= .0003 m...

Homework Statement Using the eigenstates of x_op, show that the probability of finding a system described by a wavefunction Psi(x) at a position between a and a+da is given by lY(a)l^2da. Comment on a connection to initial motivation for a wave function from 2-slit interference pattern...

1. Calculate the minimum thickness of the film for which the intensity of the reflected red ray is near zero. (This is AP Physics B 2010 (c)ii.) I found the wavelength in the film to be 4.81x10-7 m nf=1.382. 2L=mλ (destructive interference) The Attempt at a Solution My first attempt yielded a...

Homework Statement My solution isn't working out for this question. Radio waves of wavelength 125 m from a galaxy reach a radio telescope by two separate paths. One is a direct path to the receiver, which is situated on the edge of a tall cliff by the ocean, and the second is by...

I'm designing a 2-stage gearbox for a project at school (15:1 ratio, must transmit 20 hp, for a full-time 10-year minimum life). I've come up with 2 basic gear combos for my layout: 1. 16,80,24,72 2. 16,80,16,48 I've done all the calculations for each layout such as making sure that the...

Homework Statement A pair of very flat glass plates, 7.41 cm long, touch at one end and are separated at the other end by a small piece of 44 gauge copper wire, 5.08×10−5 m in diameter. An air wedge is formed between the glass plates by this supporting wire. Light of wavelength 631 nm...

I am looking over thin film interference and am having some difficulty understanding when to know if a reflected ray will be 180 degrees out of phase or in phase. I know that a ray reflecting off a medium with a higher index of refraction will have a 180 degree phase change; and that a ray...

Homework Statement Figure 35-25 shows two sources S1 and S2 that emit radio waves of wavelength λ in all directions. The sources are exactly in phase and are separated by a distance equal to 1.5λ. The vertical broken line is the perpendicular bisector of the distance between the sources. (a) If...

Homework Statement Light with a wavelength of 530 nm is incident on 2 slits that are spaced 1.0mm apart. If each slit has a width of .1mm, how many interference maxima lie within the central diffraction peak?Homework Equations sin( degree) = m(lambda)/d The Attempt at a Solution I have no...