physics / waves.mdon commit actually added physics waves: (62c8aa2)
   1# Waves
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   3## Longitudinal and Transverse Waves
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   5Longitudinal - direction of motion parallel to wave
   6Transverse - direction of motion perpendicular to wave
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   8
   9## Wavelength & frequency
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  12$$v=f \times \lambda$$
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  15Nodes - point of no motion
  16Antinodes - point of maximum motion (peaks)
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  18Crests (peaks) & troughs (azimuths)
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  22## Interference patterns
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  24Standing wave - constructive interference at resonant frequency