1. A vibration or disturbance that transfers energy.
WAVES
A vibration or disturbance that transfers energy.

2. Types of Waves
Transverse  Also known as Electromagnetic. The energy travels at right angles to the motion of the wave. Travels through a vacuum. Light is an example.
Longitudinal  Also known as Compressional waves. The energy travels in the same direction as the motion of the wave. Must have a medium to travel through. Sound is an example.

3. Parts of Waves
Electromagnetic:
Longitudinal:

4. Speed of a wave Velocity = Frequency times wavelength v = ƒ λ
Problem: How fast is a wave traveling that has a 245 Hertz frequency and a wavelength of 1.4m?