# Lecture 903, Example Problem

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I was trying to solve this problem and I couldn't quite figure it out. I first tried to calculate lambda by observing that your T=2 so I did v=(lambda/T) and solved for a lambda of 1.  This results in a K of 2pi which is not correct.  I was wondering how I should go about solving this problem, and how you calculate k, w, and phi. I understand how to do the problem before this pretty easily, but this one tricked me up. Thanks.

asked Nov 4, 2014 in General

For this question, $k=\pi/2$ and $\omega=\pi$. You can get this directly from the wave function. All that is different is the initial phase. Plug in x=1 and t=0, match $y(0,0)=2sin(\pi/2+\phi)$ with the graph. You will see both 3 and 4 are correct in producing $y(0,0)=-2$