Shift Definition and 614 Threads

To avoid confusion, I'm talking about: "A flash of light is given off at the center of the traincar just as the two observers pass each other. The observer onboard the train sees the front and back of the traincar at fixed distances from the source of light and as such, according to this...

Homework Statement struct student { char name[20]; int id; float gpa; }; student a[20]; Homework Equations insert another element into the array a. The Attempt at a Solution #include<iostream> using namespace std; #include <stdio.h> #include <string.h>...

What experimental evidence or optical measurements are used to prove that red shift is due to gravitational fields of suns, and is not simply an artefact of light passing through and being diffracted by the matter in the heliosphere of many suns before reaching earth?

Hi I have read this and to put it mildly I am confused, so maybe someone can clear this up. The dew point is defined as the point/temperature at which the Partial Pressure of the water vapour within the air packet equals the Saturated Vapour Pressure. I understand that the dew point is a...

My physics teacher has informed us that for our mock waves exam we are going to be given some relativistic questions on doppler shift, as an experiment by our loving masters. We derived the Lorentz factor and some shift equations, but we haven't done anything else and I'd really like some...

This is another one of those concepts where I understand what happens at the macroscopic level, but don't understand the why, or rather what is happening at the fundamental level. Now my understanding of QM has improved a fair amount in the last week thanks to some help from ZapperZ, but I'm...

In the Kallen-Lehmann spectral representation (http://en.wikipedia.org/wiki/K%C3%A4ll%C3%A9n%E2%80%93Lehmann_spectral_representation) the interacting propagator is given as a weighted sum over free propagators. The pole of the integracting propagator is, of course, given by p^2=m^2, m being the...

Hi, i have a simple optical system composed of: 1. objective with 50 mm focal lenght 2. CCD camera that can not be mounted behind the objective, for mechanical reasons... it can only be mounted 1-2 cm far behind the objective. So i need to "translate" the focal point of the objective 1-2 cm...

Since light emitted farther away from our point in the universe is more and more red shifted, would this mean that at a certain time we wouldn't be able to observe light further than a fixed distance since it's been red shifted beyond the electromagnetic spectrum?

When an em-wave red shifts due to leaving a gravitational field it loses energy, right? Where does that energy go, into gravitational potential energy of the photon? If so does this mean that the photon can "fall" back on the gravitating body to reclaim this energy? What happens to the energy if...

Hello everyone. I understand that a phase shift oscillator works by connecting an amplifier through a feedback network that shifts the input by 180 degrees. Although I remembered building a phase shift oscillator in my circuits class using an omp amp, I would like to build one using a bjt...

It is my understanding that, except for a couple of local galaxies, everything in the universe is moving away from us as well as from each other (relationships between inhabitants of local galactic groups excepted). If my information is acurate, how is it that a large collection of randomly...

Can anyone supply me with the mathematics behind the energy gain/ loss as a photon travels through a gravitational potential difference?

Homework Statement b) Calculate the recoil shift for the most energetic lyman line from a free H atom. c) Calculate the recoil shift for the emission of a 14.4keV gamma from a free atom of Fe-57. Homework Equations E = hc / \lambda = h \nu \Delta E = E^2 / 2mc^2 The Attempt...

So I'm planning to start a project using the Doppler shift to calculate the velocity of a moving object. The problem is, I'm not sure which equations I should use, and I saw many different equations around the Internet. So are these equations correct? If not, can someone tell me what the...

Homework Statement part b) Calculate the recoil shift for the emission of the most energetic Lyman line from a free atom of hydrogen. 2. The attempt at a solution My question isn't a physics one per se, I'm stuck on terminology. What is meant by "the most energetic Lyman line"? I'm use...

Photons are blue-shifted as they accelerate in free-fall toward the earth. When an electron or positron is conceptualized as a wave using de Broglie's equation, are the de Broglie wavelengths of the electron or positron shortened (blue-shifted) as they accelerate toward the Earth in free-fall...

Hi All, I'm sure this question has a trivial answer but for the life of me I've no idea :\ I am calculating (numerically because I am lazy and it scales/ports better to other cases) the phase shift of a particle in the non-rel Schrodinger equation tunneling through a potential step. This...

I have read on some threads that there are other possible shapes for spacetime and I wondered could any of these spacetime shapes, or their change over time, affect our measurement of red shift? Also does the matter density at the location where a photon is emitted relative to our own...

Phase shift and sinusoidal curve fitting - Finding... Homework Statement "Find the period, amplitude, and phase shift of each function. Graph each function. Be sure to label key points" y = 4sin(2x - pi) Homework Equations The Attempt at a Solution So, I got...

Ok, so let's say I have a simple half-wave rectifier like the one shown in the image below: http://img585.imageshack.us/img585/1904/unledmwc.jpg When it comes to the analysis of the circuit, during the positive cycle of the input voltage, the diode is forward biased and the output voltage...

I was talking to one of my friends the other day about doppler effect and we went into the discussion of accelerating object and doppler effect. we both agreed that the frequency shift would vary in time. then we argued about the frequency shift for different observers and here is were it got...

The basic question is: will a photon traveling through a vacuum lose some of its energy due to interactions with gravity from a massive body? Gravitational lensing implies that the photon will change its initial direction but is its energy conserved (i.e. differences in blueshift/redshift...

1. The launch vehicle takes the moon orbiter to a circular orbit around the Earth at 300km altitude. The orbiter is to perform a Hohmann transfer to a Lunar orbit, entering into a circular lunar orbit at 50km altitude. The objective of the mission is to put a 200kg orbiter around the Moon. The...

Hello. I've heard from someone that beam diffraction can be explained as the result of phase shift in a dielectric changing the pattern of maxima that we see as the "beam". I would love to see the math of this worked out- can anyone direct me to an appropriate resource? I've searched far and...

If f(t) has the Fourier transform F(ω), what is the Fourier transform of the function g(t) = f(3t) − f(4t + 7)? Use the shift property and time scaling property of the Fourier transform to obtain your answer. I have no idea how to start, please help, thanks..

In "Does the inertia of a body depend upon its energy content?," http://fourmilab.ch/etexts/einstein/E_mc2/www/ , Einstein invokes a result from his 1905 SR paper, which is that the Doppler shift of a light wave's frequency D(v)=\sqrt{(1-v)/(1+v)} is also the factor by which its energy changes...

I've been having texture problems and memory leaks for the PC version of need for speed shift unleashed. Sometimes the textures on the cars, and on the road, and in the sky, are all solid black. I had this same problem with star wars the force unleashed. Is there anything I can do to fix...

I have got what may be a silly question. I hope not. Using flip flops e.g. JK flip flops, counters can be constructed (modulus up and down counters). However when constructing shift registers data can be shifted left and right. When shifted right each the shift register could divide the initial...

Homework Statement A man riding his bicycle was caught driving through a red traffic light. The man was taken to court and trialled where he claimed he was cycling so quickly that the light had appeared to be green to him due to the Doppler effect. The prosecution accepted his excuse but...

I understand we can calculate that gravitation is neutralized at the center of a mass - say, a planet or star (or anywhere within a spherical shell); I wondered if the GRS is also neutralized, or if being pervaded by gravity - however neutralized - the dilation of space-time persists therein.

Hey all, This might seem like a strange/silly question but just humour me if you could... Is there any a-priori reason why a scattering phase shift should be linear in energy (energy of the incoming particle at infinity)? Are there examples of such shifts that have a different energy...

Homework Statement For the system of Fig. 1, construct a complete state diagram showing all 16 states of the system. Your diagram should have 16 circles, numbered 0000 through 1111, connected with arrows showing which state each state goes to after one tick of the clock. Interestingly, this...

I came across this Wikipedia article ,http://en.wikipedia.org/wiki/Intrinsic_redshift, that describes the idea of intrinsic red shift but the references seem old. What is the status of this idea today?

Hi All, does anyone know of a mathematica function that efficiently circularly shifts all array elements? e.g. {1,2,3,4,5} -> {4,5,1,2,3} without iterating? The reason I ask is because I have a huge data set I'm working with and right now iterating through is very processing intensive...

Homework Statement The Doppler shift was first tested in 1845 by the French scientist B. Ballot. He had a trumpet player sound a 463 Hz note while riding on a flat-car pulled by a locomotive. At the same time, a stationary trumpeter played the same note. Ballot heard 5 beats/s. How fast was...

Homework Statement An electron initially at rest is scattered by a photon. a) Which scattering angle corresponds to the largest Compton shift and why? b) At what minimum photon energy can half of the photon energy be transferred onto the electron?Homework Equations \Delta \lambda = \lambda_2 -...

If due to redshift, light shifts towards the red end of the spectrum and the energy of photons = hc/\lambda, then how does this reduction in energy of the photons not violate the conservation of energy law?

How do high red shift galaxies differ from low red shift galaxies? Dow e see significant differences? if so what ?

Hi, I'm looking for an equation which links capacitance to the phase difference between two microphones (picking up audio from a loudspeaker). (the speaker gives off a signal at 3 kHz). My experiment, at the end of the process, was devised to be linked into the setting of microphone...

The expansion of spacetime stretches and red shifts the wavelength of light. Is the amplitude of the wave stretched as well? So that very distant stars appear brighter, and therefor nearer?

Hi, I'm reading "The First Three Minutes" by Steven Weinberg And am confused about this paragraph... "Astronomers are able to measure the motion of a luminous body in a direction directly along the line of sight much more accurately than they can measure its motion at right angles to...

This raises an interesting physics question. What physics reason could there be for the shift of researcher interest in quantum cosmology which this Inspire search illustrates? Here is the Inspire top ten quantum cosmo list for 1996-1998...

Homework Statement A 590.0 g mass oscillates with an amplitude of 11.4 cm on a spring whose spring constant is 27.7 N/m. At t=0.00 s the mass is 3.14 cm to the right of the equilibrium position and moving to the right. Homework Equations x(t)=Acos(Wt + phi) The Attempt at a Solution...

Im planning on trying out some narrowband filters to hopefully dodge the light pollution here and get some nice photos, I was just wondering if red shift ever comes into play, could a distant object be shifted enough to be actually blocked by the filter? I know it depends on the filter and so...

in my simple opinion the red shift is caused by the increasing distance of the light source and the light destination. its accepted by everyone that light has a constant speed in space, but i think that the constant speed is relative to the source object (kinda like sound). so to keep it simple...

I would first like to thank everyone on this website. So much knowledge i haven't been able to leave. I am researching the time line of the universe and have read a lot of great articles about red shift and the Lambda-CDM. I found a Cosmology Calculator where you can find out the distance in...

Homework Statement The redshift of a galaxy is measured at the present epoch t0 and again at the infnitesimal future epoch t0 + δt0. Show that the rate of change of z with t0 is given by \frac{dz}{dt_{o}}=(1+z)H_{o}-H(z) Homework Equations Hint - Start From: \frac{\delta z}{\delta...

We are told the universe is expanding because galaxies are red shifted and that it is a doppler effect. Do blue shifted galaxies contradict the idea of an expanding universe?

The idea that distant objects are receeding from us and thereby producing a proportional redshift --seems to be a fundamental tenant in terms of current cosmological thinking and theory. There have been alternate ideas proposed in the past including the tired light hypothesis-(whereby light...