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teetar
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Homework Statement
I'm given two frequencies: 4,000 Hz, and 5,000 Hz.
They are completely in-shift at time ##t=0##.
I am to find the time it takes them to get completely out of phase.
Homework Equations
The Attempt at a Solution
I've not gotten waves very well thus far in physics. My teacher said being completely out of phase occurs at a phase shift of one half wavelength, or, at π rads. Where do I start?