Phase shift Definition and 141 Threads

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...

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...

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...

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...

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...

Homework Statement A 205 g mass attached to a horizontal spring oscillates at a frequency of 4.60 Hz. At t =0s, the mass is at x= 6.00 cm and has v_x =- 34.0 cm/s. Determine Amplitude and Phase Shift. Homework Equations x(t)=Acos(\omega*t) \omega=(2*\pi)/T T=1/f The Attempt at a...

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...

I'm reading through Hecht's book on Optics and I fail to understand something. I think it's the third edition, page 380, chapter 9 (Interference). So he's talking about spherical waves emitted by 2 sources. He says that the waves can be written under the form \vec E _1 (r_1 ,t)=\vec E_{01}...

hello friends, I have a voltage and current input signal in simulink which has a small phase shift between the two signals. Is their a way so that i can eliminate this phase difference to zero? thanks

Homework Statement An electric motor draws a 1A (rms) from the 230V (rms) mains. and is found to shift the phase of the 50Hz alternating current by 30% of the period. What is the self inductance of the coils in the motor? Homework Equations The Attempt at a Solution i've started...

One of the conditions for oscillation is that the (regenerative) feedback loop must provide a 180 degree phase shift. This is due to the fact that, for a regenerative effect, the signal must undergo n*360 degrees phase shift: 180 from the amplifier and another 180 from the feedback network...

hi i want to know why R-C oscillator is called phase shift oscillator? does it only shift the phase?How the amplitude and the frequency of oscillator ca be changed? thanks

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...

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...

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?

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

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...

Homework Statement V(x) = \inf if x \leq 0 = -V if 0 < x < a = 0 if x > a NOTE: E>V Find the wave functions in each region and the stated phase shift. Homework Equations Schrodinger Eq. Instructions note that wave functions are: \Psi_I = A\sin{kx} \Psi_{II} =...

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...

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...

If I use the following code in Mathematica f1[t_] := Cos[w t + d1]; f2[t_] := Cos[w t + d2]; data1 = Table[f1[t], {t,1,10000}]; data2 = Table[f2[t], {t,1,10000}]; ft1 = Fourier[data1]; ft2 = Fourier[data2]; To take the Fourier transform of two data sets, how can I use the resulting data...

Hello everybody. I'm trying to build a sound direction localising subsystem for a robot. I have two microphones placed a distance apart. I'm not worried about sounds behind or the distance, just the direction. I see two choices. Phase shift detection or a neural sim of interaural time...

What's the difference between Phase, Phase Difference and Phase Shift in terms of waves? I've taken a look to Wikipedia and a few other sites already, so please do not forward me to them...

I am working on the following problem. http://img244.imageshack.us/img244/9777/homeworkun4.jpg The Attempt at a Solution I realize that the relative phase shift between ray 1 and ray 2 will be \frac{4L}{\lambda} Next, I let \frac{4L}{\lambda_a}=1 and \frac{4L}{\lambda_b}=1.5 I did this...

Folks, I've got a question. Is this definition correct? \delta _i = \frac{2\pi}{\lambda_i} * n_i * \cos \, \theta _i where \delta _i is the optical thickness of medium i \lambda _i is the wavelength in medium i (i.e. not \lambda _0, the vacuum wavelength) n_i is the refractive...

Question about phase shift SHM The displacement of an object is given by x(t)=x_mcos(\omega t+\phi) If the inital displacement is 0 and the initial v is in the negative x direction, then the phase constant must be ___rads I know that if x=o then the cosine of the phase must be 0...

What I want to do is apply a frequency-independent phase shift to a Gaussian Noise signal. Obviously I can just invert it to get a pi shift. Also I can take the Hilbert transform to get a pi/2 shift and I can invert that to give myself in effect a 3/2pi shift. BUT... what I want to do is to be...

I have a single phase mains supply which I need to split it into two phases, then shift one of them by 90 degrees relative to the other (with peak values of both waveforms having the same magnitude). I know this is generally done by two branches in parallel, with a series capacitor in one...

help me guys... i reall need the answer ASAP...:cry: Thanx in advance..

Hi. I get a signal from an acclereometer that I integrate using an op-amp to get the velocity. But the problem is that this signal is phase shiftet 90 degree. Because I'm supposed to compare this signal with a reference signal that is 180 degree phase shiftet, and now I'm getting wrong...

Homework Statement A resistor of 362 Ohms is connected in series with a capacitor of 50.0 µF capacitance. A sinusoidal signal of f = 11.7 Hz experiences an impedance of 452.836 Ohms. Find the phase shift between the current and voltage at f = 11.7 Hz. Homework Equations I tried using...

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...

1. Homework Statement A wave front moving horizontally encounters a block of glass that has an index of refraction of 1.50 in its upper half and an index of refraction of 1.25 in its lower half. The wavelength of the wave front in air is 700 nm. At what lengths would the glass block cause...

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...

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...

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...

The Michelson-Morley experiment is supposed to be able to detect a time difference between the paths of light in a parallel and in a perpendicular path to the aether wind, both two-way paths of the same length. It is argued that, if such time difference exists, it will be revealed as a phase...