What is Amplitudes: Definition and 108 Discussions

The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). There are various definitions of amplitude (see below), which are all functions of the magnitude of the differences between the variable's extreme values. In older texts, the phase of a period function is sometimes called the amplitude.

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  1. K

    Pressure and displacement amplitudes

    I'm having some trouble on this problem. "The human ear is most sensitive to sounds at about f = 3 kHz. A very loud sound at that frequency would have a displacement amplitude of about 4um. What is the pressure amplitude? (Assume the wave to be sinusoidal. For air at room temperature, B =...
  2. Amith2006

    Ratio of amplitudes of sound problem

    Sir, The intensity level due to 2 waves of same frequency in a given medium is 1 bel and 4 bel. What is the ratio of their amplitudes? I solved it in the following way: L1 = 10 decibels L2 = 40 decibels Loudness(L) = 10(log(I/Io)) Where I= Intensity of sound, Io = Intensity of weakest...
  3. K

    Trees to Loops: Computing SUSY Yang-Mills Amplitudes

    From Trees to Loops and Back Andreas Brandhuber, Bill Spence, Gabriele Travaglini 49 pages, 17 figures http://www.arxiv.org/abs/hep-th/0510253 We argue that generic one-loop scattering amplitudes in supersymmetric Yang-Mills theories can be computed equivalently with MHV diagrams or with...
  4. R

    Vacuum to Vacuum Amplitudes and Functional Integrals

    Hi, I am reading chapter 5 of Ryder regarding path integrals and vacuum to vacuum transition amplitudes in presence of source. I follow the math but don't have a clear physical picture. The formula is: Z[J]=\int Dq \: exp ( \frac{i}{h}\int dt(L+hJq+\frac{1}{2}i\epsilon q^2) ) Can...
  5. Y

    How Does the Uncertainty Principle Relate to the Number of Waves in a Box?

    I have this problem: The total number of waves Nw in a box is somewhat uncertain beause of the way the amplitude falls off. For a region of size DeltaX, call the uncertainty in the number of waves DeltaNw. a.) Relate DeltaNw to the uncertainty principle in the wavelength Delta(lambda)...
  6. G

    What Determines Particle Amplitude? Examining Photons and Interference

    What, if anything, determines the amplitude of a sub-atomic particle. A specific question is do all photons have the same amplitude? I would assume that at least photons of same color do, since i can observe the destructive interference.
  7. A

    Amplitudes in a 2 part string

    I know that: yI(x,t) = AI sin [k1( x - v1t )] yR(x,t) = AR sin [k1( x - v1t )] yT(x,t) = AT sin [k1( x - v2t )] W1 = W2 k1v1 = k2v2 I am unsure about how to prove that AI = AT + AR Where AI, AT, and AR are the different amplitudes of the incident, transmitted, and reflected waves.
  8. S

    Can beats be created by two waves with different amplitudes?

    Can beats be created by two waves with different amplitudes? How will they look like?
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