Interference Definition and 999 Threads

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...

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...

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 -...

Homework Statement Two radar transmission towers located 6.4 km apart emit identical signals of wavelength 420 meters. A ship located at a point 30 km equidistant from the towers experiences a strong signal from the towers. However, as it sails parallel to the line of the towers it...

The interference pattern created by the distribution of particles (electrons or photons) is related to the wave behavior. We interpret the probability distribution as the intensity distribution of 2 interfering waves. Say, a single electron travels toward the 2-slits, it diffracts like...

Homework Statement Heres the question: Two towers of a radio station are 4.00 x 10^2 m apart along and east-west line. The towers act essentially as point sources, radiating in phase at a frequency of 1.00 x 10^6 Hz. Radio waves travel at 3.00 x 10^8 m/s. a) In which directions is the...

I'm trying to figure out the interaction between the stereo of a car and the wind/road noise coming from outside. I was debating with someone about the interaction and argued that the stereo sounded diminished in volume level because of destructive interference. But I honestly don't know...

Homework Statement What phase difference between two otherwise identical traveling waves, moving in the same direction along a stretched string, will result in the combined wave having an amplitude 1.3 times that of the common amplitude of the two combining waves? Express your answer in (a)...

Homework Statement Two slits are separated by 0.320 mm. A beam of 500-nm light strikes the slits, producing an interference pattern. Determine the number of maxima observed in the angular range -30 degrees < theta < 30 degrees. Homework Equations d*sin(theta) = m*(lambda) The...

Homework Statement A laser beam ( λ = 694 nm) is incident on two slits 0.100 mm apart. Approximately how far apart (in m) will the bright interference fringes be on the screen 5.00 m from the double slits? Homework Equations y=L\left( \frac{m \lambda}{d} \right) The Attempt at a...

Consider two identical optic fibers with deeply subwavelength tips. Let their tips be placed next to each other, at a distance much smaller than the wavelength. Let light of equal intensity come out of them in phase. Then, by the principle of linear superposition, at some distance much bigger...

Homework Statement http://img337.imageshack.us/img337/285/64902163.png Homework Equations \Delta x = \frac{\lambda L}{d} where delta x is the fringe separation L is the distance from screen to signal source d is the slit separation The Attempt at a Solution Okay you see I'm using...

Homework Statement A laser beam, with a wavelength of 532 nm, is directed exactly perpendicular to a screen having tow narrow slits spaced .15 mm apart. Interference fringes, including a central maximum, are observed on a screen 1.0 m away. The direction of the beam is then slowly rotated...

When i spin a benham top why do i see colors , Is this because of the dashed black lines , that i am now pulsing white light , so now the white light is out of phase and the red , green , yellow photons are interfering so i see colors , Is this is what is going on .

When the electron double slit interference pattern is destroyed during measurement detection, to determine which slit the electron passed through, the explanation is that the observation is responsible. Given that detection is done with photons that can interact and alter the path of the...

Homework Statement The transmitting antenna for a radio station is 7.00km from your house. The frequency of the electromagnetic wave broadcast is 536kHz. The station builds a 2nd transmitting antenna that broadcasts an identical em wave in phase with the 1st one. The new antenna is 8.12km from...

Hello everybody. I´m new in the forum, and i would like to ask a question. If light is an electromagnetic wave, why is it not affected by electromagnetic interference. For example, in electric engineering is used fiber optics cable when one wants to avoid EMI. Why? I'm looking for a plain...

I've been thinking a lot about conservation of energy recently, and in addition to my other thread, I have another (quite different) seeming "paradox" that I can't resolve. Suppose you have a laser shooting into a Michelson interferometer with distances such that the split beam exactly...

When a scanning electron microscope shoots electrons at the material they wish to observe , when the secondary electrons are ejected from the material and then received at the detector it seems like electron diffraction might affect the image , But it doesn't seem to , or maybe they got...

Is there a way to visually determine whether refraction or interference is the cause of the iridescent effect observed in rainbows, oil films/bubbles, insect shells/wings, cds/dvds, etc.? This question arose from when I was looking at thin films of minerals through a microscope. The slide was...

Consider the following: Two point-sources of lased light, one 600nm and the other 602nm. Each is collimated to form a beam 100 microns in diameter; thus, each forms a well-collimated laser beam. Aim each beam at each slit in a double-slit setup (each slit is 10 microns wide and 100 microns...

Why does the distance from a light source to the two slits make a difference in the interference pattern? Thanks, Jake

Interference -- Frequency Homework Statement Two loudspeakers at an outdoor rock concert are located 3.5 meters apart. You are standing 16.1 meters from one of the speakers and 19 from the other. During a sound check, the technician sends the exact same frequency to both speakers while you...

Hi Everybody! I have been wondering about wave generation from point sources, and interference. I have noticed that if several point sources are sited in a line much more than one wavelength long, a very directional interference pattern develops. The closer the sources and the longer the line...

In the double slit experiment, under observation, the electron acts like a particle rather than a wave. From my understanding this is because the photon that hits it for observational purposes adds enough energy into the system to affect the electron and make it chose one single path rather than...