Acoustic

Speed:
is the act or state of moving swiftly. In sound, the speed of a wave is defined as the distance a point on a wave that travels per unit of time. The faster a sound wave travels, the more distance it will cover in the same period of time.

Frequency:
equals the number of waves that passes a given point per second.

Wavelength:
is the distance between identical points in the adjacent cycles of a waveform signal propogated in space or along a wire.

Longitudinal:
In a longitudinal wave the particle displacement is parallel to the direction of wave propagation. They simply oscillate back and forth about their individual equilibrium positions.

Transverse:
In a transverse wave the particle displacement is perpendicular to the direction of wave propagation. They simply oscillate up and down about their individual equilibrium positions as the wave passes by.