Interference Definition and 999 Threads

Homework Statement Two point sources in a ripple tank are generating waves with the same wavelength \lambda. They are placed a distance apart d = 5.5\lambda: --------------------------- | | | * | | ^ | |...

Homework Statement I'm doing a lab and it says: Assume that on the double-slit plate, pattern A has exactly the slit separation printed on the plate. Shine the laser through pattern A onto a screen. Decide whether you will measure positions of maxima, minima, or both. Measure the...

1.in an intrfrnce expmnt. wit monochromatic light of wavlngth 6000 AU only 50 fringes are observable.estimate d coherence of d source. 2.show a circularly polarised lght is eqvlnt to 2 mutually perpendicular plane polarised lt wit a phase diff of pie/2. 3.fringes of equal inclination are...

Homework Statement When monochromatic light shines perpendicularly on a soap film (n = 1.33) with air on each side, the second smallest nonzero film thickness for which destructive interference of reflected light is observed is 296 nm. What is the vacuum wavelength of the light in nm...

Homework Statement Identify the following as an example of Refraction, Diffraction, or Interference 1) Rainbow pattern on a compact disk 2) The floating blotches in our eyes 3) Rainbow pattern on a beetle's back 4) The dark bands seen a a window screen Homework Equations...

hi, Our teacher told us, that interference occurs, if two waves are said to be coherent. but doesn't it have also something to do with the polarization of the two waves? so can one observe interference, if one has: circular or ellipctical polarized waves, when these two have a constant...

Hello I just bought a new Panasonic DECT 6.0 cordless phone set (4 handsets) and recently subscribed to high speed DSL internet from my phone company. On my old corded/wired phones the phone connection audio qulaity was crystal clear. On the new DECT 6.0 cordless phones << Link removed...

Homework Statement Electrons are accelerated through a 20 V potential difference, producing a mono energetic beam. This is directed at a double-slit apparatus of 0.010mm slit separation. A bank of electron detectors is 10m beyond the double slit. With slit 1 alone open, 100 electrons per...

Homework Statement Derive the equation 2t=(n+1/2)(lamba/index of refraction) to show it's the correct eq'n for constructive interference on reflection. Include a diagram. Homework Equations 2t=(n+1/2)(lambda/index of refraction) The Attempt at a Solution I'm not sure how you'd show...

Homework Statement I did the single slit light diffraction lab. The diode laser we used was 630-680 nm. It produced an image very much like the one on this page: http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/fraungeo.html#c1 How does having multiple wavelengths in the laser change...

Homework Statement So I have a similar situation with the traditional Newton rings. Instead of having however a convex lens, I have a (partial) spherical surface with height d with sitting on top of a thin film of thickness t, with d >>> t, and refractive index n and below the thin film is a...

Homework Statement In a double slit experiment, a beam of neutrons with speed 0.6m/s is diffracted by two apertures which are 0.05μm apart. a. What is the neutron wavelength? b. Where does the first minimum appear? Homework Equations \lambda = \frac{h}{p} dsin\theta =(m+\frac{1}{2})\lambda...

Homework Statement While walking along the shore at your beachfront home, you notice that there are two narrow gaps in the breakwater, the wall that protects the shore from the waves. These gaps are 9.0 m apart and the breakwater is 12.0 m from the shore and parallel to it. You go to the...

Homework Statement The figure below shows a lens with radius of curvature R lying on a flat glass plate and illuminated from above by light with wavelength λ. This photo, taken from above the lens, shows that circular interference fringes (called "Newton's rings") appear, associated with the...

Homework Statement The diameters of fine fibers can be accurately measured using interference patterns. Two optically flat pieces of glass that each have a length L are arranged with the fiber between them, as shown below. The setup is illuminated by monochromatic light, and the resulting...

Homework Statement Light of wavelength 500 nm illuminates a double slit, and the interference pattern is observed on the screen. At the position of the m = 2 bright fringe, how much farther is it to the farther slit than to the nearer slit? Homework Equations \delta=...

Homework Statement Hillary stands directly in front of speaker S1 and walks straight away (down on the page) from S1 as shown in the diagram. What is the first distance (measured from S1) at which she will hear minimum loudness? Speed of sound is 343 m/s and the frequency of the sound is...

Hi ppl, I have a question to you. What happens if we approach two lasers with different wavelengths close together while they going in the same direction? ----------------> -.-.-.-.-.-.-.-.-.> did we get the interference between the different wave length of lasers result the different...

Homework Statement In the figure the two speakers are producing identical sound waves. The solid lines represent constructive interference regions and the dashed lines represent destructive interference regions. The point labeled 1 is 662.15 m from the bottom speaker and 742.9 m from the...

In light of the fact that Wick rotation can replace imaginary exponent wtih the real one, how does it reproduce interference? For example, in double slit experiment, how would we reproduce the fact that probability of reaching certain spots on the screen is zero? After all, the exponent of...

Homework Statement A 360 nm thick oil film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the 400 nm...

Homework Statement A 360 nm thick oil film floats on the surface of the water. The indices of refraction of the oil and the water are 1.50 and 1.33, respectively. The surface of the oil is illuminated from above at normal incidence with white light. The two wavelengths of light in the 400 nm...

Homework Statement A two-point source interference pattern is generated by sources operating in phase at 1.0 Hz. The sources are 2.0 m apart and the wavelength of the waves is 0.60 m. At what angles, measured from the centre line of the pattern, are the nodal lines produced located...

Homework Statement What will happen if we use white light at young's double slit experiment? Homework Equations interference The Attempt at a Solution Will we observe several colors on the screen because white light is composed from several light with different wavelengths? Thanks

Homework Statement Suppose I have two different visible lights of different wavelengths passing through in a two-slit interference experiment. What appears on the screen is mostly a mixture of the two colours. However, one of the bright fringes, say m=2 is purely 1 of the colours (this light...

Hi All, I try to understand the outcome of following setup: The idea is that in the middle, a pair of polarization entangled photons are generated (so that the polarization of right-going and left-going are opposites of each other). The setup on left side is deviced so that if the...

Homework Statement Studying physics in High school, and for two years now we have covered two point source interference patterns with light, sound, and water wave in a ripple tank per say. The type of wave nor medium is necessary significant for me at the moment, but I am having trouble...

I believe the dual slit experiment proves that single photons and even buckyballs have to interfere with something right ? Even if it's only themselves ? So is it possible that they could be interfering with coppies of themselves from other dimensions ? Maybe 20 of them, as proposed by string...

Homework Statement A car’s radio antenna is located at a distance of 56.983 m from a brick wall, which is assumed to act like a dense barrier. The car is attempting to listen to an FM radio station with a frequency of 89.5 MHz. These waves travel at the speed of light, 3.00 × 108 m/s. The...

I am aware that the human body has electrical properties, But was baffled by what I witnessed Christmas Eve. I had a malfunctioning electric candle in the window. I picked it up to check the tightness of the bulb, and it immediately came on. I set it down and it went off. Three times this...

Homework Statement [PLAIN]http://img403.imageshack.us/img403/2696/33095583.jpg The attempt at a solution I simply took 425 nm and divided it by 4 by using the destructive reflection from thin film. I got 106 nm as my answer, which is c. Is this correct?

Lets say there are two waves in the ocean exactly identical heading in opposite directions. It seems like logically they would cancel out since they are moving in opposite directions. Yet they don't cancel out and I can't figure out why. If two cars hit each other with same force in opposite...

Homework Statement Light of wavelength 680 nm falls on two slits and produces an interference pattern in which thefourth-order fringe is 38 mm from the central fringe on a screen 2.0 m away. What is the separationof the two slits? Homework Equations Sintheta=2m(\lambda2d)...

Homework Statement See pictures for the data. Basically there's a transparent prism looking like an inclined plane and making an angle \alpha with the horizontal. Its base is 3 cm large and if we shine a vertical light of wavelength \lambda, we can observe an interference pattern as seen...

We know that the interference pattern forms even when photons (or electrons etc.) are sent one at a time. The photons only land on the fringe parts of the screen and not the dark part - as if directed by some underlying information about where they are supposed to go. So far so good...

Homework Statement Two speakers 14 m apart are emitting tones at a frequency of 1020 Hz. What is the closest distance (in m) from one speaker, along the line connecting the speakers, at which the sound intensity be will be zero? Homework Equations V= Lambda x f The Attempt at...

Hi everyone, I'm a beginer in communication science. I have very fundamental question. We know that natural radio waves are emmited from sun to Earth (as a part of their electromagnetic spectrum); what will happpen if our communication devices uses radio waves of same frequency and wavelength...

I'm not an engineer and so I appreciate everyone who contributes. 1)Is there any measurable cell phone interference from a car battery, alternator, or starter while the car engine is running if the cell phone is in the driver's seat? 2)What would this interference look like? Thank you.

Hi, This is my first post here. I have done some reading on quantum mechanics and am curious to know more. I know about the double slit experiment and the interference pattern produced. I have also read of entangled pairs. My main question is: If you have a pair of entangled...

Homework Statement An interference experiment employs two narrow parallel slits of separation 0.25mm, and monochromatic light of wavelength \lambda = 500 nm. Estimate the minimum distance that the projection screen must be placed behind the slits in order to obtain a far-field interference...

What happens to the energy in case of "destructive interference"? Hi everyone, I'll mention a few cases here. 1) In case of sound suppose we have two speakers. One gives off a certain sound and the other speaker gives off the exact inverted phase of the other speaker's sound, both with...

Homework Statement Hi all, i have a question on thin film interference. Lets say there is an oil drop on the surface of water. Light reflected from the oil drop is observed from above. Explain why interference fringes are not seen when the thickness of the oil drop increases...

Hello, I'm working on a fire/burglary alarm panel and I need to add an external relay that closes a circuit whenever a fire alarm is detected (i.e. no voltage, just circuit closure). The alarm panel has one internal relay that activates for fire, and one that activates for burglary; each of...

Homework Statement Hi Can anyone help on this. The questions is as follows: In a double slits experiment using red light, a fringe pattern is observed on a screen at a fixed distance from the double slits. How would the finge pattern change if: a) The screen is moved closer to the...

Interference with thin film :( Homework Statement A soap film in air is 320nm. thick. If it is illuminated with white light at normal incidence, what colour will it appear to be in reflected light (assume that the index of the soap film is 1.33). Homework Equations The condition for...

Homework Statement Two slit interference question: A screen is 2.2m from two slits. The distance from point P to point R (the central maximum to the 2nd dark band) is 1.6mm. This is what the pattern looks like (l) means light band... (d) means dark band ......P...R (d) (l) (d) (l) (d)...

Hey all I am using optical fibers as a read-out medium form a PCB. I see interference in the data through this fiber. Can someone shed a light on the interference patterns on the optical fiber? Usually one should not see any electronic noise in fibers. How true is it and how to get around it...

Hi. What I have is a wedge with a flat surface at the top which I have 632nm light incident normal to the surface. What I want to be able to do is measure theta of the wedge. I am having trouble drawing the connection of the formula I have directly to the optical path length difference...

If I look at the Fourier transform of the square wave signal, the peaks are at the odd multiples. In the device that I am working on, I would expect the interference at the odd harmonics of the center frequency. But I see the interference at even harmonics. When is this possible? (Only if...

Problem A thin film of oil (n = 1.30) is located on a smooth, wet pavement. When viewed perpendicular to the pavement, the film reflects most strongly red light at 640 nm and reflects no light at 548 nm. How thick is the oil film? Equations and Attempt Refractive index: air - 1 oil -...