Shift Definition and 614 Threads

Hello all, I'm currently taking an upper division circuits class as a MechE student after taking a 2 year break from the topic. We were given a problem to find the transfer fuctinon T(s) of a high and low pass filter, and then plot Vout(t)'s phase and magnitude vs. the freq. My question...

Hello All, I did an experiment recently involving two coils in series with a high frequency signal running through them. My goal was to determine at what frequency the signal in one coil would be phase shifted by 90 degrees with respect to the first coil. I was able to experimentally...

Let's say you have a body in motion, a car, an airplane or hovercraft - does not matter, looking for basic laws of physics here. 1. You know the weight. 2. You know the center of gravity at rest. 3. You know the center of lift (if applicable). Let's say our object weighs in at 600...

Homework Statement The hydrogen atoms in a star are also moving at high velocity because of the random motions caused by their high temperature. As a result, each atom is Doppler shifted a little bit differently, leading to a finite width of each spectral line, such as the 656.46-nm line we...

USA Military paper about “Psi phenomenon”... Paradigm Shift? Hi everybody, The USA Military has recently (year 2004) approved for public release and distribution a very interesting and controversial research document titled “Teleportation Physics Study.” In this document they talk about...

I have to calculate the suns period time, when given the following information; "The H_{alpha} line has the wavelength \lambda_0 = 656.1~nm . Measuring this spectrum from opposite sites of the suns equator, shows that there is a difference between that is \Delta \lambda=9\times 10^{-12}~m ...

Hello, The reason for the shifting of freqeuncies of all types of waves in response to relative motion away or towards the center of propagation, is caused by a corresponding stretching or compressing of the medium, correct? I mean for sound, if one moves toward the place where the sound...

a parallel glass plate with a thickness of 30 mm and a refractive index n = 1.65. A light beam hits the surface under an angle of β = 45°. (a) What is the parallel shift of the light beam? what is the meaning of parallel shift?? pls help

I am given this signal: x(t) = sin(4(t-1)) and I need to find X(jw), i.e. it's FT, so I am confused whether I shift by 1 or by 4, in other words whether I multiply F{sin(4t)} by e^(4jw) or by e^(1jw) which one is it? I am thinking it's 4jw... is it right?

This might be a stupid question, but it came to me the other day while reading. Since the speed of light is the same in all frames what would happen if you were chasing a light beam at .999% c, so you were heading right for it (but could never catch it) and it is ahead of you traveling at c. If...

Find the solution (in integral form) of the equation: u(x+1,t) - 2u(x,t) + u(x-1,t) = u_t u(x,0) = f(x) Hint: Use the shift formula F[f(ax-b)] = \frac{\exp{i\omega b/a}}{|a|} \overline{f}(\omega/a) So I took the Fourier transform of each term using the shift formula: \exp{(-i\omega)}...

I am reading Paul Tipler's Fundamentals of Modern Physics, (Worth Pub., 1973) and would like to understand how ΔN (Eq. 1-5, pg. 6) )is arrived at. Here is the derivation as I understand it up to that point: Michelson devised an experiment to determine the difference in the number of fringes...

A 14.4 KeV photon from 57 Fe is red shifted as it rises from a sourceat ground level to an absorber placed at the top of a tower of a height of 20 m because it has to expend energy to climb the gravitational potential. Derive an expression for thered shift as a fraction of the energy of the...

Hi! I'm new here and I have a question I hope you can help me with. I'm curious about the conclusion that our Universe is expanding and ask if the evidence of Red Shift is reliable enough - or, could the apparent Red Shift be caused by interference from Dark Energy/Matter distorting our...

From: http://www.lauralee.com/rflemath/e-h.htm I know people have used this theory to explain myths of ancient civilizations and dinosaurs in the Lock Ness etc... However, when we strip away the automatic reactions to the ideas exchanged between Dr. Einstein and Mr. Hapgood and look at the...

Let's say I have light at normal incidence. Under what circumstances is there a phase shift? Under what circumstances is there no phase shift? My best guess is that there is normally a phase shift of 180 degrees. The exception is when n_incident > n_reflected, but I don't really know. To...

Pardon me if i am not grasping something. but! Tell me if this very short presentation does not give a good argument that red shift occurs between two stationary light sources where gravity is at 90 degrees. http://creativefamily.net/science/Lecture0601.pps This lecture is from a...

Hi, We often say, an observer near the horizon of a BH finds the light traveling from far outside the horizon blue shifted, or an observer away from the BH finds the red shift of light from near the horizon. We get a conclusion that a clock near the horizon goes faster than a clocker far...

If differing wavelengths explain color variations, would not the longer "zig-zags" of the separate colors for the bluer spectrum portions of visible light suggest that they have traveled longer to get to a discrete point from that of their origin? - Assuming that the component colors of...

Hi all. I was reading: http://www.astro.ucla.edu/~wright/doppler.htm but I'm failing to understand this part: My understanding is that a galaxy cannot move faster than c (the speed of light). Why then could a galaxy moving close to c have a recession velocity greater than the speed of light...

Here's the question, A double slit experiment uses a helium-neon laser with a wvaelength of 633nm and a slit separation of 0.120 mm. When a thin sheet of plastic is placed in front of one of the slits, the interference pattern shifts by 5.50 fringes. When the experiment is repeated under...

i have searched it online but i can't find any material describing this effect. >.< what is it about?:confused: thanks for answering:smile: kit

What is the highest known blue shift?

Are there any tables for the distance against red shift of stars. I've heard that for stars close enough so you can measure the distance by triangulation it is correlated but not as strongly as the "almost perfect correlation" that I have been taught.

Why does the frequency of a photon emitted from the surface of a star decrease as it moves away from the star? if hf`=hf(1-GM/(R*c^2) then as the distance becomes larger, R becomes larger, so f`becomes smaller?

I had a thought the other day - following from general relativity, a photon experiences a gravitational red shift in frequency. Searching for a research project, I toyed with the idea of a chromodynamic red shift if a photon were to pass through a strong field. However, since the photon has no...

Hi all, we're looking at scattering theory in the QM course right now, and I've got a question concerning the approximative ways of calculating the phase shift \delta_l of the partial waves in the partial wave expansion of the scattered wave. One way (the semi-classical) to calculate it is...

http://arxiv.org/PS_cache/astro-ph/pdf/0506/0506115.pdf Title: On quasar host galaxies as tests of non-cosmological redshifts Authors: E. Zackrisson Comments: 9 pages, 4 figures Journal-ref: MNRAS 359 (2005), 1193 Despite a general consensus in the astronomical community that all...

http://arxiv.org/PS_cache/astro-ph/pdf/0506/0506040.pdf Title: Rapid growth of high redshift black holes Authors: Marta Volonteri, Martin J. Rees Comments: Submitted to ApJ letters. AASTeX format. 11 pages, 1 colour figure We discuss a model for the early assembly of supermassive black...

hi , i am new here so at first i want to say hello to all of You. as title says i have two questions about qrover's algorithm, first one is more general i guess: 1. in the most of articles i have read about this algorithm the measure wasn't well explained,problem is that authors wrote "now we...

I have a problem saying: X-rays having an anergy of 300KeV undergo Compton scattering from a target. The scattered rays are detected at 37 degrees relative to the incident rays. Find the (a) Compton shift at this angle. Now i have the angle.. but i figure i need the wavelength of the...

Lamb shift proved that within an atom the energy level of electrons changes with changes in orbital position. Given that energy and mass are related (or “one and the same” according to some texts) does this mean that within an atom electron mass varies? And if so does this not contradict...

I am to measure the rotational velocity of Io relative to Jupiter, and will do so using a spectrograph. I will measure the frequency change of a specific mineral emmision band in the spectra, and then check how much it has shifted from its original wavelenght with a table. Then I use the...

The latest figures for baryonic mass etc.

I'm working on a modification of Fizeau's experiment in 1851 about the addition of velocities. I've derived the formula for the fringe shift. But the problem is I actually don't know what it is. I know it's the movement of the interference pattern. But it has no unite, so what is the meaning of...

General Relativity is assuming the existence of a metric everywhere, in someway depending directly or not on the repartition of the energy. Must I understand this assumption as equivalent to the existence of a background geometric field ? The satellite Gravity Probe B is actually testing the...

do you get a doppler shift when your moving towards a light source? like, i know light gets redshifted with expanding space and gravity, but if light always approaches you at the same speed, how would frequency change there?

I'm not sure which sub-forums this should go in... Does the shade of blue that the sky appears to be change at all at differing lattitudes on Earth? What about different altitudes? If so, how much? Any links to specific info? Thanks for any input you have.

when observing heavenly objects, there is an important role of doppler effect. but is there a way to distinguish whether the red/blue shift is because of translational, rotational motion or perhaps thermal motion of the atoms?

This is BIG IMHO Analysis: 'Seismic' Catholic shift to Bush *snip*

http://www.setterfield.org/Redshift.htm This paper may be controversial, It discuses red shift quanta, i notice reference is given to H Arp, but i leave the reader to form an opinion.

For the relativistic doppler shift: change in wavelength = (c - Vs) To / (1 - Vs ^2 /c^2)^1/2 where Vs is emitter velocity, c is speed of light and To is time. Suppose change in wavelength was equal to just 1 / (1 - Vs ^2 / c^2)^1/2 then (c - Vs) To = 1 c -Vs = 1 / To c = Vs + 1...

I had some questions about light. Mb some1 could explain 2 me. I know about red shift and blue shift. If the object is moving towards you it's color shifts to blue and vice versa. Is this because if the object is moving towards you it compresses the light waves and if moving away it...

A 2s electron in a hydrogen atom has more energy than a 2p electron. Quantum field theory says this is because the 2s electron interacts with itself by emitting and absorbing a photon.But what if the proton and the electron carry a charge which is always repulsive.Then a 2s electron which is...

What is the cosmological red shift? I've seen it before and couldn't figure out what exactly it was. All I know is that it has something to do with the effects of gravity and how it relates to photon frequency.

HELP red shift dilemna is it at all possible that the apparent red shift of distant stellar light sources is not actually as a result of expansion?? For example, the whole distance is a mess of gravity wells that could cause red-shift, as well as the emitting characteristics of Hydrogen which...

"Red Shift" caused by space itself ?? Perhaps the distant objects are not receding at all. If "space" is not empty, but rather is a complex structure, probably containing energy which can be released (wouldn't we just love to know how), then as light "waves" - I prefer to call them...

I would like to cause a phase shift in light. I would prefer to do so by varying the voltage to the phase shift device. Is there any existing system or any suggestions? We had a bit of difficulty with this one. I dropped a few decimal points or something. Lets try this one more time. I...

most 8-bit microproc. don't contain a * or / can some offer some help on how i can use a shift instruction to do this

A train moving toward a detector at 31m/s blows a 305-Hz horn. What frequency is detected by a statiory train? Using the equation f´= f(V + Vd/ V - Vs) The answer is supposed to be 340-Hz but I don't understand how to get it. Mind helping me out?