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# Waves

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.

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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