Amplitude Definition and 868 Threads

Have a look at http://arxiv.org/abs/1202.5039 Degenerate Plebanski Sector and its Spin Foam Quantization Authors: Sergei Alexandrov (Submitted on 22 Feb 2012) Abstract: We show that the degenerate sector of Spin(4) Plebanski formulation of four-dimensional gravity is exactly solvable and...

Like photons, all particles have a wave/particle duality, so when energy is added to an electron, say in a particle accelerator, why does the "amplitude" of the electron wave never increase (say as an increase in the actual number of electrons) - why is it that the energy added always just comes...

Homework Statement Calculate acceleration and velocity of a piston. Stroke is 150mm and engine speed 3500rpm Using simple harmonic motion equations Homework Equations a = -ω^2*s v = ω*√A^2 - s^2 ω = 2*∏*f v = velocity, a =...

Homework Statement An object with mass 0.222 kg is hung on a spring whose spring constant is 86.4 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 0.886. If this system is subjected...

Homework Statement Basically we were given the attached picture and we are supposed to find at what value for the AC frequency from the Vin will the amplitude be halved at V (CE base) Homework Equations The Attempt at a Solution I think i am supposed to use V=Iz where Z is the...

If amplitude is the measure of energy in a sound wave - On increasing amplitude, the medium particles should hit each other in lesser time because they have more force(which increases their speed) and this cycle should repeat and repeat. Eventually, the speed of sound should increase. But...

An undamped pendulum of mass m = 10kg, and length L = 5m, is released at time t = 0 with an initial displacement θ(0) = 0.05 radians and an initial angular frequency ω(0) = 0.1 radians/s. I need to calculate the amplitude of the oscillations in radians, and the total energy of the oscillations...

Is there any process or device that will allow a transmission of an EM wave of a certain amplitude (say 2) but will block transmission of a lesser amplitude (say 1), such that an EM wave of a given amplitude of blocked, but a EM wave with 2x the amplitude will pass thru (even if that amplitude...

When a point source emits sound, the sound travels away from the source as a series of wavefronts - all being spherical shells - away from the source right? Now, we say the energy is conserved if we neglect damping forces in the medium, and so the power delivered by the source should be...

Homework Statement You and your friend sit on the same swing and oscillate about the equilibrium position. Your friend falls off the swing exactly at the highest point (largest amplitude). What will happen to the amplitude and frequency of your oscillation ? (a) the amplitude stays the...

A particle moves with SHM of amplitude 10 cm and a maximum speed of 0.5 m/s. ...find the objects period

I just saw a few of Feynman's lectures on QED: Reflection and transmission, and he describes the concept of probability amplitude arrows, and their representation as vectors, from what I interpreted, the length of the arrow is proportional to the probability of an event, and its angle is...

1. Homework Statement [/b] Consider the damped oscillator illustrated in the figure below. Assume that the mass is 365g, the spring constant is 112N/m, and b = 0.117kg/s. How long does it take for the amplitude to drop to half its initial value? (A*e-b*t/(2m))...

Homework Statement An object in SHM oscillates with a period of 4.0 s and an amplitude of 10 cm. How long does the object take to move from x = 0.0 cm to x = 6.0 cm? Homework Equations T = 2*pi/w x(t) = Acos(wt) or x(t) = Asin(wt) The Attempt at a Solution T = 4.0 s A = 0.10...

Hello, I am trying to understand how the most basic form of AM works. Can someone please confirm if my brief description below is essentially correct ? I know that upper and lower sidebands are created when a signal is modulated onto a carrier frequency. These sidebands result in a signal that...

Would it just be the energy of the wave (i.e. E = hf)?

Amplitude Of Single Tone Sound Wave = "Loudness"? Hello, Given a single tone sound wave: x(t) = A * sin( 2 * pi * freq * t ), what does the 'A' actually represent? Peak Intensity? Intensity Level? Peak Amplitude Pressure? What is adding to my confusion is this link...

Okay, so I have a sound wave (a visual representation). From this I can see the amplitude of the wave, However, I need to know what the sound power or the sound pressure level. Could someone please give me a formula that could help? Thanks

the amplitude of a photon gets divided when it goes through a double slit or through a mach-zender (http://en.wikipedia.org/wiki/Mach%E2%80%93Zehnder_interferometer what is amplitude of a photon? is it simply related to probability or is it, in any way, to the EM fields? what gets...

In electro-magnetic radiation is the cresting amplitude proportionate to the wavelength; or is it the same for all wavelengths, or is it a variable?

Homework Statement The question goes something like this: What % of inter atomic separation is the root mean amplitude. The data given is: Inter atomic separation : 0.29nm , T =300k , D = 20 N/m , Aluminium atomic weight 27 g/mole. How do I proceed I have no idea on how to relate mean...

This question is mostly about how to interpret notation used in Particle Physics. At lowest order the rate of b\rightarrow s\gamma is proportional to \langle B_p|b^\dagger b|B_p\rangle where p is either u or d labels and b, b+ are creation annhilation operators. However, I am unable to...

I'm reading through Peskin&Schroeder, and they mention that the probability of transition from a state |\psi_0\rangle to a state |\psi_1\rangle is given by: \langle \psi_1|H|\psi_0\rangle where H is the Hamiltonian. Can someone please explain how this formula is derived? Thx

Homework Statement Consider a block-spring system that forms a linear simple harmonic oscillator, with the block undergoing SHM. The angular frequency is 9.78 rad/s, the frequency is 1.6 Hz and the period is 640 msec. The block is pulled from its equilibrium position at x=0 (at time = 0) to...

Homework Statement A simple pendulum of length 1m with bob mass 125g is pulled 15 degrees to the right and released at t=0.What are the phase constant and amplitude? Homework Equations θ(t)=Acos(ζt+phi) ---> my teacher gave us a weird symbol that I've never seen before, it has always...

Homework Statement Undamped oscillator's period T_0 = 12s. Damped oscillator's angular frequency \omega_1 = \omega_0 * 97\% where \omega_0 is the angular frequency of the undamped oscillator's. What is the ratio of consecutive maximum amplitudes? Homework Equations Equation of damped...

Homework Statement A 800g oscillator has a speed of 120.0 cm/s when its displacement is 1.5 cm and 55.0 cm/s when its displacement is 8.0 cm. a. What is the oscillator’s maximum speed? b. What is the oscillator’s maximum amplitude? Homework Equations A= sqroot(X^2+(V^2/w^2)...

The highest note written for a singer in a published score was F-sharp above high C, 1.48 kHz, for Zerbinetta in the original version of Richard Strauss's opera Ariadne auf Naxos. The wavelength of this wave is 0.232m. Suppose people in the fourth row of seats hear this note with level 79.8...

Homework Statement Block “A” is released with initial velocity v=10 m/s. Find the period and the amplitude of oscillations after inelastic collision of block “A” with block “B”. The mass of block “A” is 2 kg, the mass of block “B” is 2 kg. The spring constants of the springs are 100 N/m and 300...

Homework Statement A mass of "m" is attached to the bottom of a vertical suspended spring with spring constant "k". Attached to that mass is a string , that is connected to a second mass also equal to "m". What is the maximum amplitude for the two-mass oscillation system in order for it...

Homework Statement A simple pendulum of length L is pulled aside to angle θm then released from rest. For arbitrary angle θ on the path of motion the acceleration along the path is -gSinθ. The speed at this point is V(θ)= √[2gL (cos θ - cos θm)]. Find the period T of the pendulum (do not...

Homework Statement A string with both ends held fixed is vibrating in its third harmonic. The waves have a speed of 192m/s and a frequency of 240 Hz. The amplitude of the standing wave at an antinode is .4cm. Calculate the amplitude at points ont he string a distance of (i) 40cm, (ii) 20cm...

Homework Statement A satellite in geostationary orbit is used to transmit data via electromagnetic radiation. The satellite is at a height of 35,000 km above the surface of the earth, and we assume it has an isotropic power output of 1 kW (although, in practice, satellite antennas transmit...

Hi everybody, this is my first post here :P I'm currently struggling over a weird problem, which asks for the amplitude (eg, max value) of a sum of many waves with different frequencies. eg, max value of \sum_0^N {A_i cos(w_i t + \phi_t)}

how can we calculate the amplitude of a one dimensional harmonic oscillator using wave function?

hello I need to informations about soliton. I know that soliton is a wave box with constant amplitude and velocity. but this datas cannot answer my requirement. piease help me fast.

I have a damped forced vibration problem. Most problems I have dealt with have a constant amplitude sinusoidal force such as F_0sin(wt). Let's say you have an applied force that decreases each second at a constant rate over 11 seconds. It looks like this: F=0.5*[(11-t)sin(2*pi*t)+(11-t)]...

Homework Statement I have a damped forced vibration problem. Most problems I have dealt with have a constant amplitude sinusoidal force such as F_0sin(wt). Let's say you have an applied force that decreases each second at a constant rate over 11 seconds. It looks like this...

I'm working on a problem that has forced vibration. The force, every time it is applied, is less than the previous impact. For clarity, the problem is dealing with a mining skip that is emptying. The inside of the skip is separated in sections using ribs but the top blocks still exert a force on...

I'm working on a problem that has forced vibration. The force, every time it is applied, is less than the previous impact. For clarity, the problem is dealing with a mining skip that is emptying. The inside of the skip is separated in sections using ribs but the top blocks still exert a force on...

Homework Statement A sound wave has an intensity level of 49 dB. What is the pressure amplitude of this wave? Po= 2x10^-5 Homework Equations β=10log(I/I0) I≈P^2 The Attempt at a Solution I can't figure out why I'm getting this problem wrong. So I set it up, 49=10log(I/I0) ->...

Homework Statement A 1.50-kg ball and a 2.00-kg ball are glued together with the lighter below the heavier one. The upper ball is attached to a vertical ideal spring of force constant 165 N/m, and the system is vibrating vertically with an amplitude of 15.0 cm. the glue connecting them breaks...

Hello, I've got a number of questions about physics. None of my physics friends have given me clearly defined answers, so I thought maybe asking here. For now, I'll just ask one simple question. So, if I have a laser pointer, which has a weak battery, it will shine with less number of...

Hello, I've got a number of questions about physics. None of my physics friends have given me clearly defined answers, so I thought maybe asking here. For now, I'll just ask one simple question. So, if I have a laser pointer, which has a weak battery, it will shine with less number of...

I'm doing a project based on the amplitude of oscillation of a car over a speed bump at different speeds. What is the relationship between velocity over the bump and amplitude of oscillation?

Two sine waves have equal peak to peak amplitudes 81 but are out of phase by 90 degrees. What is the peak to peak amplitude of the resultant wave. I have no idea how to start this question, could someone give me guidance?

How to calculate g if amplitude of a simple pendulum is negligible and the length is known? T=2π\sqrt{}l/g

Homework Statement What is the displacement amplitude of a sound wave of frequency 160.0 Hz in air at 20 °C at the pain-threshold pressure amplitude of 29.0 Pa? f = 160 Hz Vs = 343 m/s ΔP = 29 Pa Homework Equations ΔP(x,t) = (ΔP)cos(kx - wt) = β*s*k*cos(kx - wt) k = f/Vs The...

Homework Statement A block attached to a spring is experiencing simple harmonic motion. You know the value of postion, velocity, and acceleration at an unknown time. Find the period of oscillation, the mass of the block, and the amplitude of oscillation. We were given values for k, x, v, a...

Hi, I was watching http://video.google.com/videoplay?docid=-2622437302869951111" the other day and he described photons by an 'amplitude' which actually means a complex number, which rotates over time. This rotation speed gives the photon's colour/energy/frequency. Then later in the lecture...