1# Waves23## Longitudinal and Transverse Waves45Longitudinal - direction of motion parallel to wave6Transverse - direction of motion perpendicular to wave789## Wavelength & frequency101112$$v=f \times \lambda$$131415Nodes - point of no motion16Antinodes - point of maximum motion (peaks)1718Crests (peaks) & troughs (azimuths)19202122## Interference patterns2324Standing wave - constructive interference at resonant frequency