Interference Definition and 999 Threads

Homework Statement light travels through air, hits a film (n=1.3) and underneath that film is glass (n=1.5). What thickness of film would result in destructive interference The lights wavelength is 500nm. Homework Equations n = c/v V = F*λ The Attempt at a Solution I...

Hey guys, I am trying desperately to figure this problem out. I have not done a problem like this ever before, and it is on our homework in a regular high school physics class. The teachers did not even teach us, this is just my attempt from research and previous knowledge. Homework...

Hi guys Today my lecturer talked a little about quasiparticle interference (QPI). He said that if we place a QP on a metal containing a single impurity, then the QP wavepacket will travel outwards, and when it hits the impurity, it will get reflected back and create standing waves. I don't...

Hi everyone, I'm currently working on a project, a part of which involves building a sagnac interferometer. My group understands the theory behind its operation, and we are now in the process of collecting materials needed to build it. We are, however, unsure of a way to quantitatively...

Homework Statement Two radio frequency sources broadcast waves of the same frequency. They are placed 1.0 m apart. Let the x-axis be the line from one source to the other, and let x = 0 be at one of the sources. Nodes are observed at x = 0.24 m, x = 0.49 m, x = 0.74 m. 1) What is the...

Hi, I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference? Thanks

Consider two loudspeakers (emitting sound waves of the same amplitude and wavelength of 15m) and an observer located in the x−y plane, with the two loudspeakers being at (2m, 0) and (−2m, 0), respectively, and the observer being at (0, 3m) initially. (i) Suppose the intensity of the combined...

Find the slit separation of a double slit arrangement that will produce interference fringes 11.5 mrad apart on a distant screen with light of wavelength 471.0 nm. tan(theta) = y/D asin(theta) = p * wavelength I know that I'm trying to solve for a, and that asin(theta) = 11.5, but I feel like...

Hi guys, i have problem with Interference in Thin Films, i tried worked the solution not sure it is correct. Hope someone can help me check? Also there is some part on the topic i don't quite follow, 2t is the extra distance traveled inside the film, then is 2t is also rough estimate of...

Homework Statement In a double-slit experiment, the two narrow slits are spaced 0.20 mm apart. A viewing screen is put 1.2 m behind the slits. A parallel light ray is shining on the slits. (a) If the wavelength of the incoming light ray is 633 nm. What is the width of the central bright...

I'm not an engineer and I figured an EE would be able to help me on this problem. I have a garage door opener that has lost its range due to RI. I've tried everything from powering down my entire house, replacing the mother board, and the remotes and nothing works. I've worked with the...

Homework Statement A radiotelescope is positioned at a height of h=150m on a cliff overlooking the sea. A very distant galaxy emitting radiowaves, wavelength 3m, is at an angle \theta above the horizion. The radiowaves reach the telescope both directly and after reflection off the water...

Homework Statement Two loudspeakers emit 300 Hz notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck. You hear eight beats per second as the truck drives away from you. What is the truck's speed? (Assume that the speed of sound is 343 m/s.) Homework...

Hi, I am doing a project on communications engineering. I've done some background reading on CDMA and spread spectrum technologies such as Direct Sequence and Frequency Hopping. My project supervisor has asked me to find out the equation for the signal to interference ratio of CDMA systems...

Homework Statement You are standing 2.5 m directly in front of one of the two loudspeakers shown in the figure. They are 3.0 m apart and both are playing a 686 Hz tone in phase. As you begin to walk directly away from the speaker, at what distances from the speaker do you hear a minimum...

Homework Statement plane plates of glass are in contact along one side and held apart by a wire 0.05mm in diameter, parallel to the edge in contact and 20cm distant. using filtered green mercury light, directed normally on the air film between plates, interference fringes are seen. calculate...

Homework Statement Two audio speakers are facing each other, as shown in the picture: https://online-s.physics.uiuc.edu/cgi/courses/shell/common/showme.pl?courses/phys214/spring10/hwb/01/05/speakers.gif The speakers emit sound at 1300 Hz; initially the speakers emit in phase (φB = 0). Assume...

Homework Statement I have a question relating to the interference at a single frequency? Does this statement mean that the intereference has occurred between two waves which are completely in phase? I also have a question regarding if two waves which are not in phase but do not cause...

Hi all From http://en.wikipedia.org/wiki/Interference_%28wave_propagation%29: "Interference usually refers to the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency. "...

After all, the un-passed light reflects off a transparent medium with a definite index of refraction, right? HELP!

Suppose to have a beam of light reflecting over two parallalel surfaces of a material, so that the reflectd rays overlap. There is interference and the square of the amplitude is: r^2 * Eo^2 * sin (2Pi n d / L) where r is the reflection coefficient Eo is the max energy of the field n is the...

Hi I wonder if I could get help with some questions that have puzzled me related to the two split experiment and electromagnetic interference in general. I know that if you shine a laser beam through the two split experiment then inference patterns will appear, and that if the path of a...

Homework Statement Light of wavelength \lambda = 500nm, produced by an extended source, is incident at an angle of \phi= 30 degrees from the normal upon a dielectric film of refractive index, n=2, supported on a solid planar substrate. Reflectivity minima are observed to have an angular...

Homework Statement Light of two wavelenghts L1 and L2 (L1,L2 = lambda)creates interference fringes in the Young's double slit experiment. To calculate the least distance from the central maximum where the bright fringes for both L1 and L2 coincide. Given: the distance 'd' between the two...

Hi, Two speakers, A and B, are located at x = +0.5 m and x = -0.5 m. A 680 Hz signal is sent to both speakers. You then walk around the origin, x = 0, in a circle of radius 5.0 m. v_sound = 340 m/s If you walk once around the complete circle, how many intensity maxima do you hear...

I've learned that when a wave is partially transmitted and partially reflected, it loses some of it's amplitude in order to conserve energy. How then, in thin film interference, can one wave produce complete destructive interference with the other if it has been partially transmitted? Wouldn't...

So I know that for constructive interference to occur, in phase waves must be separated by a distance 2 pi. What I'm confused about, though, is what if the point they interfere at is separated by a distance 2 pi, but isn't where their crests meet? Like what if one speaker is one wavelength...

Hello, could anyone help me with this question? We have a mental experiment consisting in a source S that sends two plane waves of light that propagate in one direction and collide in a photo-detector (PD). It is important to note that the propagation of each wave is in one-dimension, so that...

Homework Statement Two loudspeakers at an outdoor rock concert are located 2.4 meters apart. You are standing 17.7 meters from one of the speakers and 20.7 from the other. During a sound check, the technician sends the exact same frequency to both speakers while you listen. The technician...

Homework Statement What is the thinnest film of a coating with n = 1.43 on glass (n=1.52) for which destructive interference of the red component (660 nm) of an incident white light beam in air can take place by reflection? Homework Equations 2t = m*lambda? The Attempt at a...

Two perfectly coherent laser beams point at two different positions on a screen. The energy transmitted by each of the beams is dissipated at the screen - it's either reflected (and thus visible to an observer) or becomes a potential energy of some sort. Now both beams are pointed at a single...

1. The problem statement: A wavelength (λ)550 nm light ray traveling thru a viscous medium n1= 1.46 strikes a a crystal n3=1.5 protected by a film n2=1.25. [b]2. Relevant equation: How can I determine the min thickness of the antireflective coating used to minimize the reflection of...

Homework Statement Radio waves of wavelength 250 meters from a star reach a radio telescope by two separate paths. One is a direct path to the receiver which is situated on the edge of a cliff by the ocean. The second is by reflection off the water. The first minimum of destructive...

Homework Statement Two loudspeakers placed X meters apart are driven in phase by an audio oscillator, whose frequency range is 1300 Hz to 1800 Hz. A point P is located A meters from one loudspeaker and B meters from the other. The speed of sound is 344 m/s. What is the frequency produced by...

Homework Statement This is a second year physics lab on diffraction and interfererence. The theory is not given in the lab manual, and unfortuneately, all of the references they list are unavailable at the library. So, I need some hep recalling a few equation that I am going to need. I am...

I'm doing a lab report on diffraction and interference. I've done several diffraction experiments (single slit, double slit, diffraction grating, Fresnel Biprism) to find the wavelength of the laser used. with Fresnel Biprism, wouldn't the refraction within the prism cause a change in...

"In this study, it is shown with reasons that superposition principle does not work in vacuum. This case can be observed by Young type double slit experiment to be carried out. Since field-field interaction is carried through charged particles, in the absence of charged particles linear...

Homework Statement Finding exact distances / angles for some maximum constructive / destructive interference 'bands' for a two-source interference - fixed source-source distance, d - screen parallel with source-source line segment - screen fixed distance away from sources, L - wavelength...

Homework Statement Two point sources of sound waves of identical wavelength lambda and amplitude are separated by distance D = 2.0lambda. The sources are in phase. (a) How many points of maximum signal (constructive interference) lie along a large circle around the sources? (b) How many points...

erm anyone knows why for destructive interference to occur for a fraunhofer's diffraction pattern, the equation is a/2sin(theta) = m(lamda)/2 , ==> sin(theta) = m(lamda)/a ? where a = slit width lamda = wavelength theta = angle the ray makes with the central axis the problem i have...

Homework Statement 3 waves are represented by these 3 waves inteferring: cos(Θ-π), cos(Θ+π), 3cos(Θ)? cos(\theta-\pi), cos(\theta+\pi), 3cos(\theta). If I want to diagram these, does the cos(\theta-\pi) and cos(\theta+\pi), cancel each other out? Do I need to convert them to sine...

1) In a double-slit experiment, two parallel slits are illuminated first by light of wavelength 460nm, and then by light of unknown wavelength. The third-order (m = 3) dark fringe resulting from the known wavelength of light falls in the same place on the screen as the second-order (m = 2)...

Hi, If I have two different light modes focused onto a single spot, could they interfere? Thanks

why do we see 2waves when we consider interference ?why not three or four?eg when we find out conditions formaxima we look for condition when 2 waves interefere...why not 3?

Homework Statement To waves with the same frequency interfere. The intensity of the two waves are I1 and I2. Show that the resultant intensity is: I = I1 +I2 + 2*sqrt(I1*I2)*cos(δ) Where δ is the phase difference between the two waves. Hint: Use the relation between intensity and...

Homework Statement Question: A soap bubble of index of refraction 1.48 strongly reflects both the red and the green components of white light. What film thickness allows this to happen? (In air, the wavelength of red light is 716 nm, of green light 511.429 nm.) n = 1.48 \lambda(r) =...

Homework Statement A two-point source operates at a frequency of 1.0 Hz to produce an interference pattern in a ripple tank. The sources are 2.5 cm apart and the wavelength of the waves is 1.2 cm. Calculate the angles at which the nodal lines in the pattern are far from the sources...

A two-point source operates at a frequency of 1.0 Hz to produce an interference pattern in a ripple tank. The sources are 2.5 cm apart and the wavelength of the waves is 1.2 cm. Calculate the angles at which the nodal lines in the pattern are far from the sources. (Assume the angles are...

If gravitational waves formed interference patterns, or just simply interfere as normal waves, couldn't that result in gravitational anomalies in absence of mass? Destructive interference could be thought of as negative gravity(dark energy), leading to expansive "forces", whilst constructive...

Okay, this may not be more related to soung engineers. But say for example, if there was a concert - an there was a crowd. What formulas and calculations are involved to make sure the the interference of sound is kept to a minimum? As they wouldn't like to have the crowd on the left to have...