Shift Definition and 614 Threads

I've heard it said that it is impossible to determine an objects absolute velocity, all one can do is find it relative to some other object... but, if the CMB is everywhere, why could you not just measure the doppler shift in all directions, and adjust your velocity so the CMB has no doppler...

Homework Statement Derive the doppler shift equation from the equation in terms of frequency to one in terms of wavelenght. Clues: frequency=c/lamda, use Taylor's expansion, velocity of source is much smaller than velocity of wave. c-velocity of wave v-velocity of source f-frequency...

It is my understanding that there is evidence from the red shift/distance relationship that while the rate of universal expansion was once decreasing (from the Big Bang until about 6-7 billion years ago -BYA for short), at about 6-7 BYA it began increasing. This, as I understand it, is the main...

First, a simple scenario to set our expectations: Consider a "stationary" massless non-relativistic test particle in empty space. We'll call the particle "P". At a very large proper distance to the cosmological "west" of P there is a neutron star, at proper rest relative to P. Let's call...

im having a hard time finding any reputable information or scientific backing to support the theory that our magnetic field will reverse and/or shift anytime soon. also would this mean that the equator areas would remain almost the same as before in terms of magnetic field?

Alice and Bob are each in their own spaceship, and are traveling radially, initially away from each other, and subsequently toward each other, at some highly relativistic relative speed, say 99c. Each ship emits light flashes toward the other. Alice observes the light from Bob's outbound...

Hi all! I have a problem about the phase shift an e.m. wave acquire when, traveling through air, it's reflected back by a mirror (or a beam splitter) with n > n(air). Now, I know the example of the thin film interference due to a π shift of the wave reflected by the medium. But I see...

Hello all, I have just joined this forum and am taking the bold step right off the bat of starting a thread. I am looking for folks who are interested in discussing what the next paradigm shift of physics will look like. I have read a few books in this area such as Kuhn's Structure of...

hi guys, i want to ask a question. what's the difference if i use shift register with and without latch. I've done some experiments and the output is the same but will it effect its efficiency? thank u. =)

We hear that the universe is expanding, and this accounts for red shift as all objecsts are accellerating away from each other. But I have also heard that it is the space itself, of which the universe made, that is expanding - not that things are moving in that space. If so, then the...

I am trying to grasp how Maxwell's equations and energy/photons are related in a doppler shift problem. The way I stated it seems to have attracted non-serious hecklers; so I am trying to restate the problem for people who know Maxwell's equations and are familiar with engineering. In...

I wonder why the amplitude of Huygens' wavelet is equal to the amplitude of incident wave multimpled by i / \lambda. I found this formula in 'Modern Optics' by Guenther p. 335 unfortunately without proof. Has anyone seen the derivation of this fact. Could you recommend me some good books in...

phase shift in wave light?? when doing reflecton/refraction/transmission of wave light exercise,we must take phase shift into account. but in what situation there is a π phase shift ? or other phase shift? i cannot apply this well! help~

Hi i was just wondering if someone could tell me how one can find the phase shift and the number of squares to move the graph over by from an equation?. We are doing cosine and sine graphs and my teacher has been away for a few days so the supply teachers haven't been really that great in...

I chose to write an essay on the "interesting" question I stumbled upon For part of it I am trying to calculate the Doppler shift in light with the relative motion of C. I suppose in the effort to not drone on for days I will first limit it to small, more simple questions and later,if we...

Homework Statement How fast would a motorist have to be traveling for a yellow (l = 595 nm) traffic light to appear green (l = 550 nm) because of the Doppler shift? Homework Equations v=[(c)(f0/fs)2-c] / [(f0/fs)2+1] The Attempt at a Solution v= Speed of motorist c= Speed of light...

Simple treble and bass controls in audio equipment use RC networks that have a phase shift equal to a radian per neper, or about 6.6 degrees per dB of boost or attenuation. Are there analog treble or bass control circuits that have no phase shift?

On the following website; http://www.cfa.harvard.edu/Walsworth/Activities/Atomic%20clock/old_atomicclock.html" I read that; The gravitational red-shift is a consequence of the local position invariance of the Einstein Equivalence Principle. I know what gravitational red shift is and...

i just have the two mixed up, and need an example to set it straight... lets say you're source is a red light (hight wavelength, low frequency) to green light (lower wavelenght, higher frequency)... that would be a blue shift? redshift = wavelength (H->L) frequency (L->H)...

Homework Statement X-ray beam with wavelenth= 1 X 10-10m and a gamma-ray beam from a Cs137 sample with wavelength= 1.88 X 10-12m. If the radiation scattered form free electron is viewed at 90 deg to the incident beam a) What is the Compton wavelength shift in each case? b) What kinetic...

Two people in a spaceship shift seats... Homework Statement Simma (mass 60kg) and Stan (mass 90kg) are testing an ultralight spacepod. They swap seats, with the seats being 4.0m apart, located at equal distances from the center of mass of the space-pod. The space-pod's mass is 50kg. Why does...

I'm reading up on the Mann Whitney test, and I can't wrap my head around one thing. Most of the test makes perfect sense. If two samples come from populations with similar medians, then the sum of ranks of both of those populations should hover around some expected value. The "T" or "U"...

Hi Is anyone aware of a circuit that could provide a phase shift independent of frequency? I have thought of doing it digitally but the number of components needed are ridicules. Thank you

A typical device in (theoretical) time travel is a wormhole, and the usual method of inducing a time shift, i.e. the two mouths at different times, is to subject one mouth to relativistic time dilation. However, I can't see why a relativistic boost will result in a time shift. It seems that...

Presenting the aberration of light effect we consider that two observers at rest in I and I' in the standard configuration equipped with laser guns start to emit light when they are instantly located at the same point in space. The problem is to find out a relationsship between the directions...

Homework Statement Could someone please explain, in very simple words, the horizontal shift of a graph? I've used the search button, textbooks, and google and I'm just not comprehending this. Why does the graph f(x-1) shift f(x) 1 unit to the right and not left? Homework Equations...

The formula which accounts for the Doppler shift is derived from the invarainace of the phase of a plane wave. [1] The plane wave is a mathematical construction associated with an infinite source os oscillation or with a very high source-receiver distance. The same formula is derived...

At Estevan, Saskatchewan, the latest sunrise time is at 9:12am on Dec 21. The earliest sunrise time is 3:12pm on June 21. Sunrise times on other dates can be predicted from a sinusoidal equation. There is no daylight saving time in Saskatchewan and the period is 365 days. Convert the time into...

That's today for me, guarding a piece of the European sky for the last time, in the night of Sat -> Sun 7-8 Feb 2009 and then retirement. :approve: :rolleyes: :frown:

I'm currently enrolled in College Algebra, and it is possible that I'm making too much out this; however, this is bugging me a bit and I can't quite get my head around it. I understand how to perform the various shifts and stretches of the graph of a function, but I'm trying to reach a better...

Homework Statement Let S be the unilateral shift and compute SS^* and S^*S. Also compute S^n S^(*n) and S^(*n)S^n Homework Equations The Attempt at a Solution First what is meant by unilateral shift?

What is the meaning of phase and phase shift?? and How can I obtain phase shift from the sine curve ?? http://www12.0zz0.com/2009/01/16/17/965512159.jpg Note : I'm a begginer in physics , so please if you can , please explain the concept in details .. Thank you ..

I'm trying to follow some working by lecturer; Treating delK (previously found in first bit of question), show that the energy En of the usual hydrogenic state [nlm> is shifted by some expression given. basically we start with \[ \frac{1}{2m_{0}c^{2}} \left\langle...

In EM wave polarization. Where is linear polarization where \gamma =0 or \pi . \gamma = +/- 45 deg and amplitude of Ex and Ey are equal to give circular polization etc. My question is why there are different angle of \gamma on the first place? If you set the reference at x...

Were there any experiments that proved doppler shift of light on a fast moving object - that it has higher frequency if the object is moving towards you and lower if the object is moving away?

Hello, this question might not be particularly clear, but I'd like a quantum mechanical description of the classical idea of external reflection by a medium. Now, the way I see it, a photon (or numerous photons if necessary) approach the boundary of a medium. Classically, the reflected wave has...

Homework Statement By 2025 a spaceship shuttle service operates between the Earth and Mars. Each spaceship is equipped with identical mono chromatic head and tail lights, and their cruising speed v relative to earth, is such that the headlight of a homeward-bound spaceship appears green (...

Suppose two observers A and B are moving with regard to each other at relative velocity = v = 0.5c, which they have determined for each other by measuring the time interval that a point of the other frame takes to pass by two points of their own frame, whose clocks are synchronized using the...

Homework Statement What is the frequency shift of a 72 GHz police radar signal when it reflects off a car moving at 111 km/h? (Radar waves travel at the speed of light = 340 m/s.) -------- f' = f(1 +- u/v) (moving observer, + appr, -receding) f' = f/(1 +- u/v) (moving source, - appr...

[SIZE="5"][FONT="Arial Black"]SOLVED Homework Statement A plate of of Mass m contains an ice cube of mass M and side L. Find the shift in centre of mass when th ice melts. (Gravity absent) The Attempt at a Solution I think that the centre of mass will come down by ML/2(M+m) But my book gives it...

Homework Statement Given a molecule of chloroethene (vinyl chloride) or ClCH=CH2. Rank the hydrogen atoms in the molecule in terms of which will have the greatest chemical shift. Homework Equations None The Attempt at a Solution Since the Cl and the double bond are both...

Hi, i have a question bout the chloride shift that occurs in the red blood cell. After the carbon dioxide has dissociated into the Red Blood Cell's plasma and became H+ and HCO3- i would like to know why must the HCO3- must go out and combine with the Sodium ions and since the H+ ions have...

I know M31 is on the list and I know there aren't a lot of these objects at any distance. Long ago I subscribed to the thought that EM probably fatigues slowly as it propagates through space or any medium for that matter. :-) I would like to see the actual data we have on blue shifted...

I heard about a book called 'null physics' which is supposedly a paradigm shift in modern physics that unifies many aspects of science. Anybody read this book and can clue me into the main ideas? Thanks for the time...I teach science.

If not Doppler, what type of transformation does Hubble's law utilize?

The book gives the equation: \frac{\Delta\textit{v}}{\textit{v}} = \frac{GM}{c^{2}R} the problem gives me the mass of the sun, it's radius, and the wavelength of light being emitted. So basically I can solve the right side of the equation, but I'm just not sure about how to express the amount...

Homework Statement Find the minimum lateral shift in position of the centre of gravity of a standing man whose mass is 80 kg, when is carrying a 14 kg pail of water. Assume that he wishes to have an equal load on each foot. How is this shift in his centre of gravity accomplished? Homework...

Random question that I thought of while trying to fall asleep last night. :) We all know that galaxies moving very fast away from us exhibit visual redshift. If gravity waves / gravitons are real, they must then have a frequency of some kind. Does the frequency of a gravity wave affect...

Considering the simple case of two observers O1 and O2 lying on the same radius at positions r=r1 and r=r2 respectively. Using a result from Stephani(1) I work out that the ratio of frequencies of light sent radially between these observers is given by this ratio, numerator and denominator...

Here's something that I recently thought about: If we assume a Doppler shifted EM wave retains the amplitude of the unshifted wave, then we must be creating/annihilating photons. This seems consistent with the conservation of energy; the removal of several photons removes energy from the...