Interference Definition and 999 Threads

As we know, Bragg's law is based on the path length difference between light which interfere with themselves after being scattered from atoms in the crystal. If you google "Bragg's law", you will see numbers of pictures showing two light rays being scattered from two different atoms. Those...

Homework Statement The question is " Two large boulders lie between the house and Farmer Joe's favorite radio station. Farmer Joe cannot put the antenna on his house because the howl of the wind through it keeps Mrs Joe up all night. Where is the next best place Farmer Joe can put his antenna...

Homework Statement A lens (##\mu##=1.5) is coated with a thin film of refractive index 1.2 in order to reduce the reflection from the surface at ##\lambda=480 nm##. Find the minimum thickness of the film which will minimize the intensity of reflected. [Assume near normal incidence]Homework...

Homework Statement Two speakers are emitting identical sound waves with a wavelength of 4.0 m. The speakers are 8.0 m apart, directed toward each other. At each of the noted points (a-e) in the above diagram (at 2,3,4,5, and 6 meters, respectively), is the interference constructive...

Another newbie question if I may... I have previously questioned some of the general assumptions made about the double slit experiment. Particularly the idea that particles of matter cannot create an 'interference pattern'. I always read that if you shot matter at a double slit that you would...

Homework Statement 2 point sources 20cm apart produce 3 cm waves at a rate of 8 waves every 1.2 secondsHomework Equations how many nodal lines are present what is the angular deviation of the 3rd nodal line? what is the angle between the 3rd nodal line and the 5th nodal line? The Attempt at a...

I do not know how to approach this. I am trying to use r1 - r2 = mλ but I can't seem to find the answer! please help. I figured it out that it is constructive, but i just don't know how to mathematically prove it. r1 - r2 = mλ.

Hello everyone, I'm a photographer and am developing a project in which I'm needing some help. I went to some engineers friends first but they told me Physicians would be the ones who would have the answers I need. I'd like to know how can I interfere in the way my camera's sensor...

I do not understand the full theory behind destructive interference. Hence I need helps: 1. The topic on destructive (and constructive) interference was always discussed on light and sound wave. Will this theory applicable on other radiation such as gamma? 2. During two wavelenghts met at...

So if there are as many galaxies in the Universe as is claimed what's the role of interstellar combination of light waves on the view of the sky we get here on Earth?

I've looked at the DCQE paper by Kim, et al (arXiv:quant-ph/9903047) but I was not able to follow the math leading to the calculation of the patterns R_01, R_02, R_03, and R_04. Specifically, I was hoping to understand the source of the pi phase shift between R_01 and R_02. Is there a property...

Suppose two loudspeakers are separated by three meters and are being driven by exactly the same sinusoidal signal at a frequency that can be varied. If you are located four meters away directly in front of one of the speakers, determine three lowest frequencies for which you would hear...

Is this correct ? I have an issue for the minima formula when n=1 I get theta = 90 degrees. This doesn't make any sense. Is my method correct ?

Although it is well known that a series of individual photons will build up an interference pattern in a double slit setup, there have been few (if any) experiments where such a pattern is built up by sending photons through one at a time. Here is a great experiment from one of the top quantum...

Thin Film Interference Problem: A hair is placed at the edge... Homework Statement Thin Film Interference Problem: A hair is placed at the edge between two 10.0 cm glass plates of n= 1.52. Light of 400 nm wavelength shines on the glass and an interference pattern is formed. If the...

I'm not clear as to how the overall interference pattern (or lack thereof) observed in the quantum eraser experiments (http://grad.physics.sunysb.edu/~amarch/ ) ends up being the same if the eraser is present or not present. My thinking follows. Say N entangled photons are sent through the...

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...

Two in-phase sources of waves are separated by a distance of 4.00 m. These sources produce identical waves that have a wavelength of 5.00 m. On the line between them, there are two places at which the same type of interference occurs. Where are the places located? I already know the...

Homework Statement Homework Equations In question. The Attempt at a Solution To be clear it's part (vi) that's unclear to me. In order to ignore the cosine term it has to reduce to 1. This can happen, only if k(x1+x2)/2 = ωt Is this a correct assumption ? Also, it is known that k = 2∏/λ...

If two sound sources (A, B) are placed in a water tank and emit sound waves at the same frequency, phase and amplitude, if I measure the sound intensity at point A, will the detected signal will be ~double than the emitted signal of each sound source? I think that the answer is yes because of...

1. when wave is destructive interference ,where is the energy? for example, two plane wave have opposite phase ,they will destructive interference completely,but where is the energy? in antireflection film, the reflection wave is disappear!why? where is the energy? where is the wave? 2.in what...

Homework Statement http://www.mediafire.com/view/?3efd7326e49kteb I've worked out all except part (iv). These are my workings : http://www.mediafire.com/view/?elswc5g5412zhzq I just can't see how to get rid of cos(pi*(x1+x2/λ -wt). Also, where does the I0 come from ?

Homework Statement http://www.mediafire.com/view/?09c89b8986u5zls The above is a question from my problem sheet. I've got no idea how to attack this since its been very poorly explained in my lecture handouts. Can someone please help me ?

Homework Statement Two identical loudspeakers are located at points A & B, 2m apart. The loudspeakers are driven by the same amplifier (coherent and are in the same phase). A small detector is moved out from point B along a line perpendicular to the line connecting A & B. Taking speed of sound...

If separate baffle around two different substances，What impact on the interference fringes？

Homework Statement Two flat slides of glass are separated at one edge by a thin wire, as shown below. The top surface of the upper slide and the bottom surface of the lower slide have special coatings on them so that they reflect no light. The system is illuminated with light of wavelength...

Usually the only indication that a system (maybe particle) is in a superposition of different eigenstates of a particular observable is the finding of interference. I wonder if there is any interpretation that would consider the possibility of having a system (maybe particle) in a situation in...

I have a question about coherent light in anti-phase, I'm probably thinking about this wrong but I just can't understand what happens to the energy in the wave when two waves of the same wavelength, frequency and amplitude are in anti-phase as the resultant wave is 0.

Homework Statement Light strikes two plane sheets of glass with a thin air space between them as shown. If the light has a wavelength of 580 nm and the air space between the glass has a thickness of 870 nm, predict whether the reflected light as demonstrated by rays A and B will cancel or...

If electron waves weren't standing waves in Bohr's circular orbit, why and how would the waves interfere ?

I am doing some reading on Quantum Mechanics, and I do not understand this concept. Here is an excerpt from "The Universe and the Atom" by Don Lichtenberg. Sorry for the bad formatting. I don't understand why we can't answer which slit the particle when through. What else could it have gone...

Homework Statement When a thin soap film is very thin, we see it as black. How thick (in nm) is the film in the region where we see the first red band? Take the wavelength of red light to be 752 nm and the index of refraction of the soap to be n = 1.33. Homework Equations [2nt/λ] - 1/2...

I will glad if you can help me to find information that explain what is it in easy way in two things that are related to communication 1. Air interference 2. wi fi access point

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 Do noise-cancelling headphones use spatial or temporal interference? Homework Equations The Attempt at a Solution They use spatial interference, right? Temporal interference would cause beats which is not noise-cancelling.

So my textbook says that the equation for the frequency of beats is |{ f }_{ 1 }-{ f }_{ 2 }| and the equation for effective frequncy is \frac { { f }_{ 1 }+{ f }_{ 2 } }{ 2 } , but what is frequncy of beats and effective frequency anyways? Edit: Opps. Should've posted it here...

Homework Statement (this is high school level) The pic below shows interference fringes observe in Young's fringes experiment: Explain why wider slits at the same spacing could produce fringes at the outer edges brighter than some of the fringes nearer the centre. Bear in mind there was a...

Hi, I'm reading N. Zettili Quantum mechanics. In the "double slit experiment", when the beam of the electrons pass the the two slits, they present an interference pattern on the screen. But when we have a light source there to trace the electrons, we see what we have expected to see of the...

why unequal fringe width in Michelson interference pattern?

I previously posted about an RF interference issue that was affecting a pair of Klipsch ProMedia 2.1 speakers here. I have since found that a neighbor living across the parking lot broadcasts transmissions of up to 2,000 Watts from his apartment, which has been the cause of this issue. I have...

I am trying to understand how QM theory (wave-functions) are applied to Interference pattern calculations for unequal slits for a single particle double slit experiment case 1: both slits are equidistant from the "center", however one slit is bigger and the ratio of the width between the slits...

Hi everyone! I have to do an experiment in the lab related with interference in sound waves with same frecuency. I am just looking for ideas or suggestions. Thanks!.

- why is it that fewer rings are observed when the plates are moved closer together (given wavelength , monochromatic source). What equation shows this relation? - Consider a non-monochromatic source, such as a Sodium Lamp, as the distance varies, both patterns change but at differnt rates -...

I have some questions regarding a fabry perot interferometer. (they aren’t problems as such however I have had a good look around the internet and am struggling to find what I’m looking for). 1) Why is it that a circular fringe pattern is observed. How does a single source interfere with...

Homework Statement Two narrow slits are cut into a sheet of paper and set in front of a laser beam, causing an interference pattern to appear on the wall. If the distance from one slit to the third bright fringe is 0.5000004 m and the distance from the other slit to the same bright fringe is...

Homework Statement A very thin sheet of brass contains two thin parallel slits. When a laser beam shines on these slits at normal incidence and room temperature (20.0 ), the first interference dark fringes occur at 32.5 from the original direction of the laser beam when viewed from some...

Homework Statement A radar tower sends out a signal of wavelength . It is meters tall, and it stands on the edge of the ocean. A weather balloon is released from a boat that is a distance out to sea. The balloon floats up to an altitude . In this problem, assume that the boat and balloon are...

See attachment please. After that, please point out, the order of the dark fringes. I mean I can't see where is m=0 dark fringe? Where to start? I want to know so I can know that radius enclosed by each fringe. Thanks.

I am looking for: Any experiment/paper that shows - complementarity between single- and two-photon interference (coherence and entanglement) in the Temporal domain.

Homework Statement The problems are attached in the photo below (or at least I'm hoping they are, doing this from my Ipad makes this somewhat diffcult) Homework Equations Not really an equation, but the Principle of Superposition states that the amplitude of two interfering waves are added...