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If the form of a sound wave traveling through air is s(x, t) = (7.0 nm)...

If the form of a sound wave traveling through air is s(x, t) = (7.0 nm) cos(kx + (3007 rad/s)t + φ), how much time does any given air molecule along the path take to move between displacements s = +2.0 nm and s = -2.0 nm?

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