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# Ch 11 and 12

This is just a demo map that you can delete right away, if you feel like it...

## Waves

### Properties of Waves

Velocity, speed and vector

Frequency, cycles per time

Period

Wavelength, distance between the centers of consecutive compressions

### Types of Waves

Longitudinal, the motion of particles in the medium is along the same line as the direction of propagation of the wave

Transverse, the motion of particles in the medium is perpendicular to the direction of propagation of the wave

Combinations

Seismic Waves (S-Waves and P-Waves), Triangulation of S- and P-Waves to find the focus of an Earthquake

Harmonic waves repeat sinusoidally

Traveling wave, Wave that moves in space and time

Periodic, repeats the same pattern over and over

### Graphing Traveling Waves

One of the two independent variables must be held constant If x is constant, one particular point is described as a function of time. Frequency If t is constant, the basic shape of the wave is shown for each instant of time Wave Length

### Superposition of Waves

Constructive

Destructive

Reflection, Bouncing of waves

Refraction, Bending of waves

## Sound

### Longitudinal Pressure Waves

Pressure as a function of time and space

Described by both pressure and displacement

### Audible Range 20hz-20kHz

Infrasound, <20hz

Ultrasound, >20kHz

### Amplitude and Intensity of Sound Waves

Decibel Scale, dB

### Standing wave

reflecting wave, makes look like stand still

Standing Waves on a String, Antinodes, 1/2 wave lenth in the middle, Nodes, never move

### Longitudinal Pressure Waves

Pressure as a function of time and space

Described by both pressure and displacement

### Timbre

Fundamental, lowest frequency in a complex sound wave

The rest of the frequencies are called overtones

### Pitch

the perception of frequency