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Waves are disturbances that transport energy without transporting mass. Learn the mechanism underlying sound, deep ocean swells, light, and even the levitation of objects in mid air.

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The source of a sound vibrates according to the equation

\[ y= 6 \cos{(6 \pi t)}. \]

If it sends out waves of velocity \( v= 21 \text{ m/s},\) what is the wavelength \( \lambda \) of the waves?

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