# Chapter 15

### 28 terms by Tmillhouse

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### Medium

A physical environment in which phenomena occur

### Mechanical Wave

A wave that requires a medium through which to travel

### Electromagnetic Wave

A wave that consists of oscillating electric and magnetic fields, which radiate outward at the speed of light

### Sphere

A three-dimensional surface whose points are equally distant from the center; a globe

### Transverse Wave

A wave in which the particles of the medium move perpendicularly to the direction the wave is traveling

### Longitudinal Wave

A wave in which particles of the medium vibrate parallel to the direction of wave motion

### Crest

The highest point of a wave

### Trough

The lowest point of a wave

### Amplitude

The maximum distance that the particles of a wave's medium vibrate from their rest position

### Wavelength

The Distance from any point on a wave to an identical point on the next wave

### Period

In physics, the time that it takes a complete cycle or wave oscillation to occur

### Frequency

The number of cycles or vibrations per unit of time; also the number of waves produced in a given amount of time

### Doppler effect

An observed change in the frequency of a wave when the source or observer is moving

### Reflection

The bouncing back of a ray of light,sound or heat when the ray hits a surface that it does not go through

### Diffraction

Bending of wave as it passes through an opening

### Refraction

The bending of light as it passes through a medium

### Interference

the combination of two or more waves that results in a single wave

### Constructive Interference

A superposition of two or more waves that produces an intensity equal to the sum of the intensities of the individual waves

### Standing Wave

A pattern of vibration that simulates a wave that is standing still

### Destructive Interference

A superposition of two or more waves that produces an intensity equal to the difference of the intensities of the individual waves

### Vibration

Wiggle in time, No net movement

### Wave

Wiggle in time and space, Net movement of wave, Created by vibration

### Surface wave

Only appear on surface of 2 medians, particles move parallel and perpendicular to wave direction

### Origin Line

Line of equilibrium

### Fixed

Reflection is inverted

### Free

Reflection is identical

### Node

Point of Destructive interference

### Antinode

Point of Constructive interference

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