Amplitude Definition and 825 Threads

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?

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.

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...

Is there a equation that calculate the energy of a wave acccording to the amplitude Another question, The plank equation E = h.f calculate the energy of any wave according to the frequency? If so, why doesn't the amplitude affect the energy (in the equation)?

Homework Statement Consider a damped oscillator Assume that the mass is 318g, the spring constant is 104 N/m, and b = 0.106 kg/s. How long does it take for the amplitude to drop to half its initial value? M = 318 g Or 0.318 kg K = 104 N/m b = 0.106 kg/s Homework Equations n / a The...

Waves in general have three properties: frequency (related to wavelength), amplitude, and speed. When referring to light as a wave, it's wavelength and speed are always referenced but never its amplitude, and I was wondering if light has a fixed amplitude for all wavelengths or if it changes...

diamonds shine brightly because light inside them is reflected repeatedly within its walls.why this repeated reflection increase the brightness of light??

Homework Statement Write a wave in one space dimension as ARe(ei(kx-wt-d))where A is the amplitude of the wave. Find a second wave of the same frequency such that the sum of the two vanishes at x = 0 and x = L. Assuming the wave velocity c = w/|k| is fixed, for what frequencies ! is this...

Hi ! I need your help ! I have been kind of stuck with the following problem for a few days : I made measurements on a plate radiating sound with an accelerometer and I found very low values of displacement(1-10 pm !). It seems very very very low (less than 1 atom !) Depending on the...

1. Does the amplitude of a pendulum's vibration have effect on its' frequency? 2. F prop. to L or F prop to 1/Square root L where L is length and F is frequency. 3. Absolute Failure. Cannot Re-Do experiment due to lack of equipment.

Homework Statement I want to know how could I extract the amplitude(of the sinusoid component) of a random continuous wave w.r.t a certain frequency response? The teacher said the Fourier Expansion can do that but I'm really confused by the limits and integrals. Homework Equations...

Homework Statement The circuit in attached figure behaves as an oscillator. What is the oscillation amplitude? 2. The attempt at a solution With H(s), I've calculated the oscillation condition: KM \geq L_1+L_2, and the oscillation frequency: \omega = R_1/\sqrt(L_1 L_1 - M^2) How can I...

When you have i*e^(i@) as an amplitude, when you conjugate, do both i terms switch signs? I tried this and keep getting wrong answer. Thanks in advance. BTW this has to do with spin half particles.

General enquiries (template may not be suitable) - When the question provides value of AC voltage amplitude, is this the same value of peak voltage? - Also, in current waveform, when do we use peak current and rms current? - In ohm's law equations we use rms current, so in the current...

Hi, As part of my Physics Class, we created a spreadsheet that animates to waves moving in opposite directions to illustrate standing waves. In order to test we were told to put the same values of amplitude, wavelength and speed (frequency was calculated from wavelength and speed) for both...

Homework Statement http://img717.imageshack.us/img717/418/unlednsf.th.png The amplitude of small oscilliations for the bob is x0, and the amplitude of small oscilliations for the cart is y0. The length of the pivot is l . What is the maximum velocity of the bob relative to the Earth ...

I'm brushing up on squeezed coherent state and have seen them defined in terms of position and momentum squeezing and in terms of amplitude and phase squeezing...is there a relation between the two? Am i missing something obvious :p ?

The frequency and the period of Simple harmonic motion don't depend on the amplitude. Meaning that changing the amplitude of a simple harmonic oscillator doesn't affect its frequency.. amplitude is the max displacement. Doesn't it make sense that if the max displacement is larger, then time...

I recently simulated a parallel resonant tank circuit on multisim. I put an oscope across the tank circuit and I get an AC signal, but what interests me is that it is amplitude modulated. The oscillations slowly build up in amplitude, hit a peak and then die back down. I think that the...

Homework Statement Two waves of the same frequency have amplitudes 1.02 and 2.27. They interfere at a point where their phase difference is 59.5°. What is the resultant amplitude? Homework Equations Resultant Amp = (Amp1 + Amp2)cos(theta/2) The Attempt at a Solution Okay this...

For Amplitude Modulation, it is understood that the bandwidth of a passband signal is always twice as much as that of a baseband signal, for example if the bandwidth/max frequency of a message/baseband signal is 1 kHz and a carrier of 1 MHz is modulated with this baseband, then a "sum"...