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Ch 11 and 12
by Dustin Brown
# Ch 11 and 12

## Waves

### Different than Point-like Particles

### Oscillate and transmit energy

### Intensity of transmission

### Signal transmission

### Standing or Moving Waves

### Properties of Waves

### Types of Waves

### Mathematical Descriptions of Waves

### Graphing Traveling Waves

### Superposition of Waves

## Sound

### Longitudinal Pressure Waves

### Audible Range 20hz-20kHz

### Amplitude and Intensity of Sound Waves

### Resinence increases energy

### Standing wave

### Longitudinal Pressure Waves

### Timbre

### Pitch

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Velocity, speed and vector

Frequency, cycles per time

Period

Wavelength, distance between the centers of consecutive compressions

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

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

Constructive

Destructive

Reflection, Bouncing of waves

Refraction, Bending of waves

Diffraction, Spreading out of waves

Pressure as a function of time and space

Described by both pressure and displacement

Infrasound, <20hz

Ultrasound, >20kHz

Decibel Scale, dB

reflecting wave, makes look like stand still

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

Pressure as a function of time and space

Described by both pressure and displacement

Fundamental, lowest frequency in a complex sound wave

The rest of the frequencies are called overtones

the perception of frequency