1. 1 Vibration: A repeated back-and-forth or up-and-down motion. Energy: The ability to do work.

2. 2 Wave: A disturbance that travels through a medium from one location to another.

3. 3 Mechanical Waves: Waves that require a medium through which to travel. Examples: sound waves, ocean waves, seismic waves. Medium (medium- singular/ media- plural) : The material through which a wave travels. Three types of media waves can travel through: Solids, Liquids, Gases.

4. 4 Electromagnetic Waves: Waves that do not require a medium for travel (can travel through a medium or a vacuum). Examples: light, heat, x-rays, microwaves, radio waves, infrared waves.

5. 5 Longitudinal Waves: Waves that move from left to right---parallel to the wave energy. Transverse Waves: Waves that move up and down– perpendicular to the wave energy.

6. 6 Properties of a Wave

7. 7 Properties of a Wave: Transverse vs. Longitudinal

8. 8 Crest: Highest point of a wave. Trough: Lowest point of a wave.

9. 9 Amplitude: Maximum distance a wave varies from its rest position (height of a wave). Wavelength: The distance from two corresponding (or the same) parts of a wave (crest to crest or trough to trough).

10. 10 Compression: The part of a longitudinal wave where the particles of the medium are close together. Rarefaction: The part of a longitudinal wave where the particles of the medium are farther apart.

11. 11 Frequenc y: How many waves can pass a given point per second, measured in Hertz (Hz).

12. 12 Wave Speed We can use what we know to determine how fast a wave is moving. What is the formula for velocity? velocity = distance / time v = / T v = f velocity = frequency * wavelength This is known as the wave equation.