# How to reconstruct information from a graph of an oscillation? [closed]

We are given a graph of the position of a wave (amplitude). How can we calculate the wavelength, frequency and the maximum speed of a particle attached to that wave?

We have

Speed = wave length $\times$ frequency,

$W=2 \pi \times$ frequency ,

$V_{max}=A\times W$.

So how to calculate A?

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## closed as too localized by Qmechanic♦, dmckee♦Nov 15 '12 at 19:51

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well, this is some type of sinusoid. Wavelength, in a very rough and general way, is the spatial period of the wave, the length required to come back to its original starting point. In this case, wavelength is 4 meters for B and 2 meters for A. Does the problem give more info? –  Dylan Sabulsky Nov 13 '12 at 5:23
They gave me speed and they are asking frequency and max speed ? –  Alpha Nov 13 '12 at 5:25
Please add that to the problem itself. When asking a question you should state the full question or the particular concept you are having trouble with, and then list what you know and/or what you've tried. –  Dylan Sabulsky Nov 13 '12 at 5:28
$2\pi\omega \cdot A = v_{max}$ so try $v_{max}=\lambda \omega=A \cdot 2\pi\omega$. Solve for what you want, $A=\frac{\lambda}{2\pi}$ where $\lambda$ is different for each wave, as I enumerated in the comments, $\lambda_A=2$m and $\lambda_B=4$m.