# TOMS Waves Chapter 15

## 20 terms

### Wave

A disturbance that transfers energy from one place to another without transferring matter

### Mechanical wave

Can travel through liquids, solids and gases but not through a vacuum. Examples are sound, water and seismic.

### Transverse wave

A wave in which the disturbance is perpendicular to the direction that the wave is traveling.

### Crests

The highest point of a transverse wave.

### Trough

The lowest point of a transverse wave.

### Longitudinal wave

A wave where the particles in a medium move parallel to the direction that the wave travels.

### Compression

The regions in a longitudinal wave when the particles in the medium are closest together.

### Rarefactions

The regions of a longitudinal wave where the particles are the farthest apart.

### Electromagnetic waves

A wave that can travel through empty space and matter

### Amplitude

The maximum distance that a wave moves from its starting point

### Wavelength

The distance on a wave to the same point on the next wave

### Frequency

The number of wavelengths that pass by a point each second

### Hertz (Hz)

The SI unit for frequency

### Absorption

The transfer of energy by a wave to the medium through which it travels

### Transmission

The passage of light through an object, for example a window

### Reflection

The bouncing of a wave off a surface

### Law of reflection

When a wave is reflected off a surface the angle of reflection is equal to the angle of incidence

### Refraction

The change in direction of a wave that occurs as the wave changes speed when moving from one medium to another

### Diffraction

The change in direction of a wave when it travels by the edge of an object or through an opening

### Interference

Occurs when waves overlap combine, forming a new wave