Waves in air, fluids and solids GapFill

Waves are the repeated motion of particles (or fields) around a point, that carry energy from one place to another.
 SoundPolarisedElectromagneticSeismicLongitudinalTransverse waves are waves where the particles oscillate in a direction at right angles to the direction in which the wave transfers energy.
 LongitudinalTransverseElectromagneticSoundPolarisedSeismic waves are waves where the particles oscillate in the same direction as the direction in which the wave transfers energy.
Features of waves include:

•  displacementwavelengthfrequencyamplitudewave speedperiod, the number of waves that pass a point every second, which is measured in  metresjouleshertznewtonssecondswatts
•  frequencywavelengthperiodamplitudewave speeddisplacement, the distance between two corresponding points on a wave
•  wave speeddisplacementwavelengthperiodfrequencyamplitude, the furthest a particle travels from its central point
•  periodamplitudewave speedwavelengthfrequencydisplacement, the time taken for a single cycle of a wave to pass a point
•  frequencywave speedperiodamplitudewavelengthdisplacement, the rate at which energy is transferred by the wave through a medium

Frequency (f) and period (T) are related by the equation  f = √(T)f = 1/T²f = T²f = T/2f = T³f = 1/T.
Wave speed (v), frequency (f) and wavelength (λ) are related by the equation  v = f²λv = fλ²v = f/λv = f²/λv = λ/fv = fλ.