Shift Definition and 614 Threads

I recently heard about the effects from The Doppler Effects at high relative speeds (significant fractions of c). For example you will eventually will even get burned/die by the radiation of the CMBR being ao intensly blueshifted while you're approaching the speed of light (relative). So...

Ron Paul may very well be the most honest Congressman, but are any of his ideas really practical in increasing freedom? I agree with him that we don't need more government, but I don't think we need less either; we need more direct and accountable government. Please correct me if you think I am...

I was wondering if something could be redshifted to the point that all of the EMR it was emitting was outside of the visible spectrum, thus not being able to be viewed. I googled it and found some people discussing it, there answer was essentially no, because the object would be emitting all...

Hi, I understand the idea of red shift and how that explains that galaxies are receding, etc. I just don't understand how the measurement is made. I know that, in labs, we can shine white light at hydrogen and analyze the absorption spectrum. Some black lines are going to show up, due...

What I want to know is... if objects apparently traveling away from us at high speed, shift the light towards the red end of the spectrum ( and towards us, the blue )... surely the same effect would be experienced if the distant object was in fact stationary (hypothetically) and it was us...

Given the Doppler shift equation quoted here: http://en.wikipedia.org/wiki/Doppler_effect#General \frac{f_r}{f_s} = \left(\frac{c + v_r}{c + v_s} \right) where c is the velocity of waves in the medium; vr is the velocity of the receiver relative to the medium; positive if the receiver is...

Hi - I am trying to make a shift register using NOR Gates. I have been given multiple HD74LS02P Quad 2-Input Positive NOR Gates, LED lights, resistors, a breadboard and an Arduino UNO. I have been trying to do this for a long time now, but I don't think I really understand how it works (the...

Homework Statement I'm working on this problem here: http://hyperphysics.phy-astr.gsu.edu/hbase/astro/redshf2.html The answer is already listed, it's the steps I'm worried about. I don't see how they get from step 1 to step 2 here. They don't even tell me what T is. It seems...

I was considering the following question; 'A fire engine traveling at 70m/s drives past a van traveling at 30m/s. The speed of sound in air is 330m/s and the fire engine has a frequency of 200Hz when stationary. At what frequency does the van driver hear the siren?' I understand you have...

Would it be possible to stand at a point, surrounded by sensors and fire beam of light of at specific frequency at every sensor and determine our absolute velocity without a reference based on the amount of red/blue shift detected in the frequency of each beam? Wouldn't light observed by the...

Find the phase shift of a function. Y=-5sin(x-pie/2) The Phase shift is (pie/2)/1 which equals to pie/2. The correct answer is units to the right though..which is where I need clarification on. My book said if phi is less than 0, it is too the left.. being -pie/2 wouldn't this...

I was listening to a lecture about the expansion of the universe and found myself confused about the light we see from very distant galaxies. These galaxies are red shifted because they are moving away from us and the photons are being stretched. Does this mean that the galaxy will appear to...

Ok, I know the Fourier effect of a time shift is a multiplication with an exponential: x(t-t0) → exp(-j2∏f*t0)X(f) Now say Y(f) is the Fourier transform of y(t). What I am wondering what is the difference in the Fourier space when convolving Y(f) with either X(f) or exp(-j2∏f*t0)X(f)...

If this is the wrong place to be posting this, feel free to lock this thread. I wasn't sure if this belonged in "classical physics" or "quantum physics"; this seemed like the appropriate place, but I'm not 100% certain, as it does involve subatomic particles. Anyways, to get to the matter at...

Hi guys, Short question here, just wondering if it's possible for a capacitor, alone in a circuit with an AC sinusoidal voltage source to experience phase shift? Meaning can the voltage over a capacitor have a different phase to the voltage from the voltage source. Thanks!

Question: as title says. I'm not a physicist at all and I do not know much about how people obtained the big bang theory from red shift. So here is what I thought from red shift: In a time period t1, a distant body emits a light wave with a certain amount of energy with n oscilations(I don't...

Hi everyone, I've got a one-dimensional non-autonomous ODE of the following form: dy / dx = f(x,y;w) x_{0} = g(w) y_{0} = h(x_{0};w) --- i.e., w is a parameter that influences both the derivative dy/dx along with both coordinates in the initial condition (x_{0},y_{0}). I basically want to...

Hello, I am trying to work out this exercise for my personal research connected with my bachelor thesis. The task is to compare equations (25.42) and (25.47) and express $u_0$ in terms of \tilde{L}. I have so far put the two equations together getting \begin{equation}...

Hello guys, I have a quick question: Would a leftward shift of the supply curve result in a shortage?

This is quite a frustrating problem for me so hopefully somebody can describe it in such a way that it settles in my mind. It is the concept of voltage and current being out of phase. Inductors are frequently described as responding to changes in current but does this really make sense...

Lets say I am in free-fall towards some massive body and I have 2 mirrors and photons bouncing in between them. Now as I fall closer to the massive body the light should get blue-shifted right? And let's say that the frequency of light that I started with is x. As I fall closer I put a jar of...

Hello friends, Could you please explain me Gouy Phase Shift, i have gone through the wikipedia article and i know that it occurs because of the focusing although i am not able to get a physical picture of the same, so it would be really nice if anyone can explain me in simple words about this...

Was just learning red shift for my A level final exam and thought about this: Okay so I have a galaxy with a fixed amount of stars (for the duration of this thought experiment) producing a fixed power of light, which can be assumed to be from its centre. The galaxy is receding from the Earth at...

I have always been puzzled by how we see an object from the past and can tell what it is doing now if it is billions of light years away. Given that; 1. the shift in the measurement of the light spectrum indicates the speed at which an object is retreating or getting closer. 2. that...

Homework Statement Determine the Laplace transform: g(t) = 2*e^{-4t}u(t-1) The Attempt at a Solution Essentially we're told for a time shift we multiply the Laplace transform pair of the function (without the delay) by e^{-as} So here a = 1 (for the delay) The Laplace transform for e^{-4t}...

From the special relativity theory , for explaining the red-shifting of a photon, that has been red-shifted, is the following: point O: origin point of emitted photo, in Galaxy GlxO point R: receiving point of photon, in Galaxy GlxR GlxO, O ---------->----------------R, GlxR Suppose...

Consider a source of radiation that is emitting the radiation at the highest possible frequency inversely proportional to the Planck time interval as measured in the rest frame of the source. What frequency would an an observer that is moving towards the source measure? What frequency would an...

I have re-written this as as I accidently deleted my original post. I was wondering if the relativistic Doppler shift of a reflection from a mirror moving away from the observer was the same as the Newtonian equation in the special case that the mirror is orthogonal to the direction of motion...

Homework Statement I have a 13.56MHz signal to be used in a power sensor. However, in order for it to go through the RF/IF Phase and Gain Detector [AD8302], I need to shift the phase of this 13.56MHz signal by +90 degrees. I want to avoid using Transistors, due to the variation in β of...

Theoretically, would everything be REALLY REALLY blue at the singularity of a black hole because of the blue shift caused by all the light racing to it (the singularity)? Arigato, -llama

hello I'm working on a manual shift override on an automatic transmission i have most of my design completed but have no clue where to begin the second half. the idea is to create something to tell me what gear i am in, i wanted to connect a circuit in parallel to the triggers for shifting to...

Homework Statement I'm trying to relate phase shift and time shift Fourier Transformers Homework Equations x(t-t_0) → e^(jwt0)X(jw) The Attempt at a Solution I've attached a picture of my work. I'm a bit confused as to how I would be able to make that simplification towards the end...

A "simple" application of dirac delta "shift theorem"...help Homework Statement show that for a, b, c, d positive: δ(a/b-c/d) = bdδ(ad-bc) Homework Equations ∫f(x)δ(x-a)dx = f(a) The Attempt at a Solution Ok so I start with ∫δ(a/b-c/d)f(x)dx But I am not sure how to apply the shift...

Homework Statement http://desmond.imageshack.us/Himg810/scaled.php?server=810&filename=screenshot20120131at923.png&res=medium The Attempt at a Solution So in particular I want to look at the last part of this problem. That is, "Show that S^n = 0" I know that dim(KerS^k) = k and...

Can someone explain how the Stark Effect works in Layman's terms? I'm trying to understand how an electric field can cool down atoms. What is the electric field doing exactly to the atoms? How is it lowering the atomic energy levels? Is there a difference between Stark Shifting and Stark...

Hi, i am trying to do a bit shift in systemverilog and compare the bit. For example: i give a input A=011. Then the input will compare with another digital that i have already setup in fsm like 010. Now it will do the compare, 0 to 0---> bitmatch=1 1 to 1 ---> bitmatch=1 1 to 0 ---> bitmatch=0...

Homework Statement Hi I think I have confused myself: If I have a linearly polarized beam incident on a plane mirror with higher index, will the 180-degree phase shift change the direction of the polarization? Say, from lying in the 1st-3rd quadrant to lying in the 2nd-4th quadrant...

Hello I understand that red shift is a measurement of relative speed. What I am looking for is what the number after the z means. Is it a percent of c or, Or is it it just a scale that physics uses to note the difference between different objects. Thanks for your time. Kevin

Homework Statement P15. The police car with its 300 Hz siren is moving toward a warehouse at 30 m/s, intending to crash through the door. What frequency does the driver of the police car hear reflected from the warehouse? (5 marks) Homework Equations doppler shift for an approaching...

Homework Statement How fast would a star have to travel to make violet light (λ = 400 nm) appear to be blue (λ = 450 nm)? Assume the star is moving along the line that connects the star to the Earth. Homework Equations λr = λc / (c-Vr) f= fo (c +- Vr / c +- Vs) The Attempt at a...

Homework Statement Estimate the Doppler shift for a radio wave reflected from an airplane moving directly toward you at a speed of 292 m/s. Assume the radio wave has a frequency of 9.7x10^6 Hz. Homework Equations fo = fv/(v − vt) The Attempt at a Solution Using the above...

I want to take an audio signal, and shift the waveform 180 degrees. How would I do this? I have read that if you take a simple class a amplifier, and feed the signal into the base of the NPN transistor, you will get an output that is shifted 180 degress. Example: Will this work?

Hi! I have two (stupid) questions: 1) We can determine what elements are present in distant stars by studying their spectrum, right? But if the spectrum of some star is redshifted, wouldn't we be fooled into believing some elements to be present there that might not really be there, due to...

Heya Everyone :blushing: Im slightly confused as to how LC phase shift oscillator work ? Its a circuit consisting of 1 op-amp ( used as oscillator), 1 LC loop, few resistors. The op-amp has a reference voltage applied to the non-inverting end (+ve). The inverting end has a feedback...

Dear All, I am confusing total internal reflection for a light wave traveling from denser medium to lower dense medium. I know we get lateral shift i.e. goos hänchen shift with total internal reflection, but Do we have phase shift due to goos hänchen shift with total internal reflection...

Homework Statement A bat is pursuing an insect, and using echolocation of 41 kHz sound waves to track the insect. The insect is initially 34 cm from the bat but then moves to a distance of 44 cm as it tries to escape. What is the difference in the two echo times that the bat measures...

When a light wave move from a medium with lower refractive index to medium of higher refractive index, at the boundary, the reflected light wave will undergo a phase shift of ∏ rad. Compared to the transmitted light, the reflected light lead by ∏ rad or lag by ∏ rad?

Homework Statement Light with a frequency of 6.1(1014) Hz is measured from a star known to produce light with a frequency of 6.0(1014). How fast is the star moving toward or away from earth? Homework Equations f = f0(v + vo)/(v-vs. f=observed frequency f0 = original frequency v=wave speed vo =...

In a lab session we were investigating the LC tank circuit of a superhet radio. The tank consisted of a ferrite coil antenna connected in parallel with a variable capacitor. A signal generator was connected to a second ferrite antenna (the drive antenna) and placed close to the first in order to...

Hi all Another question (sorry) Water vapour in the air will phase shift back to liquid when it reaches its Dew Point temp (Partial Pressure = the Saturated Vapour Pressure), OK I have this. For this phase shift I assume that there are Condensation Nuclei and these nuclei are at a lower...