Amplitude Definition and 825 Threads

this just out http://arxiv.org/abs/0705.2388 The loop-quantum-gravity vertex-amplitude Jonathan Engle, Roberto Pereira, Carlo Rovelli 6 pages "Spinfoam theories are hoped to provide the dynamics of non-perturbative loop quantum gravity. But a number of their features remain elusive. The best...

[SOLVED] Amplitude of Sound Waves from Two Sources at a Point Problem. Two sources, A and B, emit sound waves, in phase, each of wavelength \lambda and amplitude D_M. Consider a point P that is a distance r_A from A and r_B from B. Show that if r_A and r_B are nearly equal (r_A - r_B \ll r_A)...

Say we have two waves of the same amplitude are about to collide with each other. The preceeding wave travels at a slightly higher speed before interacting with the final wave. However, instead of passing through the final wave its speed and size is transferred into the final wave where it...

I am controlling a device with a 3-5kHz square wave. The device will attenuate an optical signal based on the voltage given to it, which should range from 0-5V (maximum of 20 V, but most extinction happens at 5V). I am wondering what the best way to go about doing this would be. I was...

Hi, Homework Statement There is a 2.0 kg mass riding on top of a 3.8 kg mass as it oscillates on a frictionless surface with a period of 3.0 s. The upper block just begins to slip when the amplitude is increased to 50 cm. What is the coefficient of static friction between the blocks? The...

In Feynman's Lectures on Physics, he constantly refers to the phase when discussing quantum mechanical amplitudes, but does not elaborate on what the phase means physically (e.g. the way the square of the amplitude gives the probability of finding a particle somewhere). So, if someone can...

hey everyone I really don't know whether this is the right stream for posting these kind of questions, but anyways here it goes.. Can anyone please explain to me the amplitude modulation and frequency modulation, or at least any website that xplains it, bcoz i am totally confused with...

Is there any study anywhere considering paths through a sample space from one element to another? Is there an "amplitude" associated with these paths?

amplitude, frequency, and energy? this question came up in our music appreciation class: does it take more energy to increase the amplitude of a soundwave of a high frequency than it does a lower frequency wave?

An object with mass 0.269 kg is hung on a spring whose spring constant is 80.3 N/m. The object is subject to a resistive force given by -bv, where v is its velocity. The ratio of the damped frequency to the undamped (natural) frequency) is 0.849. If this system is subjected to a sinusoidal...

I'm having a little trouble understanding some of this. Here's a few things I don't understand: - are wave amplitude and frequency/wavelength correlated, or are they independent of each other? (I understand freq and length are correlated because the speed of light is constant) ... (my guess is...

Homework Statement A 60 W monochromatic point source is radiating equally in all diresctions in a vacum. What is the electric field amplitude 2m from the source. Homework Equations Intensity=Power/(4*Pi*r^2), Intensity proportional to square Amplitude The Attempt at a Solution...

Two identical traveling waves, moving in the same direction, are out of phase by Pi/2 rad. (a) What is the ratio of the amplitude of the resultant wave to that of the common amplitude of the waves I'm having trouble with this problem because I feel like I'm not given enough information...

Here is a quick question, and it would be nice if you someone could answer yes or no. I need it to do a problem because I am unsure whether it is. The question is: Does amplitude affect the period of oscillation of a spring in simple harmonic motion? I think no because of the equation: T =...

Problem: A 1.0 kg mass is riding on top of a 5.0 kg mass as it oscillates on a frictionless surface. The spring constant is 50 N/m and the coefficient of static friction between the two blocks is 0.50. What is the maximum oscillation amplitude for which the upper block does not slip...

A fisherman’s scale stretches 2.8 cm when a 3.7 kg fish hangs from it. a. What is the spring constant, and b. What will be the amplitude and frequency of vibration of the fish is pulled down 2.5 cm more and released so that it vibrates up and down? a) F=ma F=(3.7 kg)(...

A resistor with a resistance of 500 ohms and a capacitor with with a capacitance of 2 x 10^-6 f are connected in parrallel to an ac generator that supplies an rms voltage of 260 v at an angular frequency of 377 rad /s find the current amplitude in the resistor (Ir)peak. I know I have to...

How does one calculuate/analyz RF range and amplitudes given off buy discharging spark gap.

<-z|x> is the amplitude for a particle in state |x> to be in state |-z>. a particle in state |x> can be in |+x> or |-x>, correct? |+x> = [1/sqrt(2)]|+z> + [1/sqrt(2)]|-z> |-x> = [1/sqrt(2)]|+z> - [1/sqrt(2)]|-z> How would this be calculated? Would the amplitude be: <-z|+x>...

Before we begin, recall the simple formulas; for reference see http://eosweb.larc.nasa.gov/EDDOCS/wavelength.html Velocity / Wave Length = Frequency (Hertz) Speed of the wave = Frequency x Wavelength Wavelength = Speed of the wave / Frequency AND Where TIME is the RECIPROCAL of...

Hi, a quick and easy one I hope someone can help me with. What would be the general expression for a DSB-AM modulated signal in terms of the Carrier Signal C(t), Baseband Signal S(t) and the modulation index m? Many Thanks

I have been working on this problem for an hour and can't seem to figure it out. I know there must be something fundamental that I must be doing wrong. Can someone give me a pointer? A platform of mass 0.8 kg is supported on four springs. A chunk of modeling clay of mass 0.6 kg is held...

Greetings. I'm a little bit confused about the dimensions of a probability amplitude in a QFT calculation. My understanding a the squared, spin averaged\summed Feynman diagram should be dimensionless. However, if we consider a decay process, say pair creation from a photon or the decay of the...

Sir, When a wave is reflected from a free end or a rigid end, will there be a change in amplitude always?

In 1926, Born suggested that the square of the wave at any point is proportional to the probability of finding the particle at that point. Born was led to this interpretation by relationship between the intensity of light and the square of its amplitude. Since we can renormalise the function...

Gents I have one question: If I have expresion for amplitude of some process and this amplitude has pole, I say I have particle caryring such features (suppose mass that makes this pole), if I change some parameters in expression for amplitude and if I get another pole, I say in this case...

a block of mass 4kg is hung from a spring, causing it to stretch 8cm at equilibrium. the 4kg block is then replaced by a 5kg block. the accleration of gravity is 9.8m/s^2. how far will the 5kg block fall before its direction is reversed? i don't know if this helps but i found K for the...

Question: "A pendulum with a length of 2.82m is released from an initial angle of 17.5 degrees. After 1100s, its amplitude has been reduced by friction to 5.30 degrees. What is the value of b/2m?" Word Done: A = A(initial)e^(-betaT) Basically I have done the problem on the basis...

Suppose I have an eliptically polarizied EM wave, whose electric field can be written as \vec{E}=A\cos(kz-\omega t)\vec{e}_x+B\sin(kz-\omega t)\vec{e}_y, where the constants A and B are amplitudes of the x and y components of the beam, respectively. How would I report the amplitude of the...

Ok, I'm stuck again... A block of mass M1=0.490 kg sits on a block with a mass of M2=4.50 kg that rests on a frictionless surface and is connected to a spring. The spring has a spring constant of k=16.6 N/m. The block is displaced and undergoes Simple Harmonic Motion. What is the largest...

argh hello guys, I've been trying to find out a simple answer to this question but all the resources I've looked at seem to skim over it or contradict each other, but simply: Do electromagnetic waves have a variable amplitude? "Intensity" is not necisarilly the same, if you're using the...

Is the speed of a spring in a wave affected by changes in amplitude? If yes, describe. Is the speed of a spring in a wave affected by changes in frequency? If yes, describe.

For my homework, To find Amplitude of the wave, for a longitudinal wave traveling down a copper rod. Given: frequency, radius of copper rod, average power, Young's constant, density, wavelength. what equation should I consider? I'm thinking something like P=(omega*amplitud)^2 because I...

hi, this is the last question I'm having trouble with.. the question is: Fine sand is sprinkled on the horizontal membrane, which vibrates in the vertical direction with frequency f = 500 Hz. The sand particulates bounce at the height of 3 mm over the level of the position of equilibrium of...

Sry, i think i put this in the wrong forum last time. Here is the problem i have been working on. An AM radio station broadcasts isotropically (equally in all directions) with an average power of 3.20 kW. A dipole receiving antenna 70.0 cm long is at a location 4.00 miles from the...

Consider the amplitude for a free particle to propogate from \vec{x}_0 to \vec{x}: U(t) = \left\langle \vec{x} | e^{-i H t} | \vec{x}_0 \right\rangle I guess I don't understand what it means for a particle to propogate from one "position" to the next. If the particle is not in a...

Recently, there was a question i came across that asked: The graph shows how the amplitude of an oscillating system varies with its driving frequency. What will the resultant graph be if the system is placed in a fluid? My answer was that the peak would be smaller and shift to the right...

A large ant is standing on the middle of a circus tightrope that is stretched with (T) tension . The rope has mass per unit length (u). Wanting to shake the ant off the rope, a tightrope walker moves her foot up and down near the end of the tightrope, generating a sinusoidal transverse wave of...

An AM cosine wave is represented by x(t)=12+7*sin(pi*t-(1/3)*pi)]*cos(13*pi*t). Use phasors to show that x(t) can be expressed in form of: A1cos(w1*t+phi1) + A2cos(w2*t+phi2)+A3cos(w3*t+phi3) where w1<w2<w3. I am really stuck with this. don't know where to start. can someone please help me...

many references tell that the dynamic stiffness will reduce when vibration amplitude increases. And the experimental result is just so. But why there is such rule?who can explain it theoretically?

Hello everybody, I am trying to use a pair of Tektronix FG 503 Function Generators to modulate a carrier wave and produce an AM modulated signal. I tried running the output of one generator into the VCF input of the other, but it seems to give me FM modulation. I did this because I am...

A little while ago I posted a thread asking the same question but didn't really get an answer so I am going to try to rewrite it. I'm having trouble understanding how the charge density of an electron (or any particle) is the square of its wave function. One problem I have is when there are...

What is the difference in amplitude between red and blue photons? Which has a great amplitude? Where is the definition of a photon's amplitude defined?

A structure withstands a vibration of amplitude x and frequency y for z number of cycles. How many number of cycles the structure will withstand if the vibration amplitude is doubled. How many number of cycles the structure will withstand if the vibration frequency is doubled?

I am interest in finding the amplitude and wavelength of an actual wave in nature that apply to the equation: wavelength = v/f where v = speed of light. This kind of wave would be example of light wave, electron wave, or radio wave, I assume. What I need is the exact measurement of it's...

For lunch you and your friends decide to stop at the nearest deli and have a sandwich made fresh for you with 0.300 kg of Italian ham. The slices of ham are weighed on a plate of mass 0.400 kg placed atop a vertical spring of negligible mass and force constant of 200 N/m. The slices of ham are...

Hi I'm attempting this question and I'm wondering if this is the correct way of going about it or if I'm completely off track: For lunch you and your friends decide to stop at the nearest deli and have a sandwich made fresh for you with 0.300 kg of Italian ham. The slices of ham are weighed on...

what happens to the maximum velocity if you double both Amplitude and period of a SHM? the equation is x(t) = A cos (wt + f) v(t) = -A w sin (wt + f) f is phase constant, w = angular velocity i know if i double A and T, the first part of the v(t) equation will be like: -2A *...

When a tsunami comes from a deeper region into a shallower region, its amplitude changes?Would you figure out a equation related to the content of energy of a wave in terms of frequency and amplitude? How can I get a brighter pattern of diffraction of a water wave besides adjusting the hole...

What affects the size of the amplitude of a wave sent by an antenna?